2-6 September 2024
CJD Bonn Castell
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Displaying 127
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127
Session:
Celebrating 30 Years of JIVE
Presented by Prof. Huib J. VAN LANGEVELDE
on
2 Sep 2024
at
16:40
Session:
Celebrating 30 Years of JIVE
Presented by Dr. Zsolt PARAGI, Dr. Bob CAMPBELL
on
2 Sep 2024
at
17:20
IRAS 20126+4104 (G78.122+3.633) is a well-studied high-mass protostar that still presents unanswered questions, such as the cause of 6.7 GHz methanol maser short-term fluctuations (ranging from 5 to 60 days) and how individual maser cloudlets respond to transitions from long low-activity periods to long high-intensity periods. To address these questions, we are utilizing combined 6.7 GHz methanol
... More
Presented by Artis ABERFELDS
on
5 Sep 2024
at
10:15
High-resolution imaging of explosive transient systems, such as supernovae and gamma-ray bursts, enabled by VLBI offers a valuable and complementary perspective for studying these systems. By resolving the system down to milli-arcsec level, VLBI studies of these transients shed important insights into both intrinsic and extrinsic properties of the system. Measurements of source size expansion, pro
... More
Presented by Dr. Marcello GIROLETTI
on
2 Sep 2024
at
15:00
Session:
Poster Session
We present the result of the angular diameter distance measurements for a blazar TXS 0506+056 ($z=0.3365$), a radio-bright active galactic nucleus (AGN) whose jet is aligned with the line of sight.
We used the 15 GHz Owens Valley Radio Observatory (OVRO) 40 m single dish (SD) data from MJD 54474 to MJD 59023 (12 years) and the 15 GHz Very Long Baseline Array (VLBA) data from MJD 54838 to MJD 6012
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Presented by Mr. Chanwoo SONG
Presented by Mr. Geferson LUCATELLI
The study of star formation activity (SF), active-galactic-nuclei (AGN) and their relation with feedback and accretion mechanisms plays a fundamental role to understand how galaxies evolves. Local Luminous and Ultra-Luminous Infrared Galaxies (U/LIRGs) serves as a key point to facilitate such studies. Radio observations can be made with high-angular resolution, are unaffected by dust, allowing to
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Presented by Mr. Geferson LUCATELLI
on
3 Sep 2024
at
12:00
Session:
Poster Session
GMVA observations are accompanied by a lot of metadata (e.g., so-called `ANTAB` files) which include system temperature (Tsys), antenna gain, and weather information (WX) for each of all those participated GMVA stations. They are required for amplitude calibration of GMVA data which is an essential part in the data calibration. Unfortunately, Tsys measurements almost always have some erroneous val
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Presented by Dr. Daewon KIM
Session:
Poster Session
Spatially-resolved radio observations of the ultracool dwarf (UCD) LSR J1835+3259 have shown extended radio emission consistent with the presence of a steady radiation belt powered by synchrotron emission, and aurora, powered by the coherent electron cyclotron maser mechanism. Those results show that, similar to the Jupiter case, radio emitting UCDs possess dipole-ordered magnetic fields with radi
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Presented by Dr. Juan Bautista CLIMENT
Session:
Poster Session
Very long baseline interferometry (VLBI) observations reveal that active galactic nuclei (AGN) jets often exhibit bending at parsec scales. While individual cases have been studied, broader trends across a large sample remain unclear. We analyse 123,000 multi-frequency VLBI images of 17,000 AGNs. From the total number, we extract 7,927 objects with resolved jet structure, identifying 586 (7% of 7,
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Presented by Mr. Vladislav MAKEEV
Session:
Poster Session
The Automatic Correlation System (ACor) is a web-based platform designed to enhance observation planning, data storage, and processing. It automates scheduling for both single-dish and interferometric modes using the VIRAC radiotelescope complex in Irbene, Latvia, which includes the RT-32, RT-16, and LOFAR radiotelescopes. Key requirements for ACor include open access, web-based functionality, and
... More
Presented by Mrs. Karina SKIRMANTE
The process of jet formation and collimation in Active Galactic Nuclei (AGN) as well as their interaction with the host galaxy are still key open problems despite decades of astrophysical studies. While cm- and mm-VLBI studies have made progress in understanding jet collimation in strongly Doppler-boosted one-sided jets, the symmetry of these systems and the interplay with the properties of the ho
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Presented by Dr. Anne-Kathrin BACZKO
on
3 Sep 2024
at
14:30
Nearby radio galaxies are the ideal targets for VLBI studies aimed at exploring the regions surrounding the supermassive black hole at the center of AGN. In this talk I will present results from millimeter and centimeter VLBI studies of
several misaligned jets, focusing on the relation between the accretion mode, efficient vs. inefficient, and the observed properties of the jet base on scales o
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Presented by Dr. Bia BOCCARDI
on
3 Sep 2024
at
14:00
Session:
Poster Session
Active Galactic Nuclei (AGN) form the most abundant class of γ-ray sources. Due to Doppler boosting, the vast majority of these consist of Blazars (viewing angle θ < 8° − 10°), while misaligned (MAGN) sources (θ > 8°−10°) account for a few percent of γ-ray-detected AGN. Despite their low abundance in the γ-ray sky, MAGN are a fundamental tool to study relativistic jets, precisely beca
... More
Presented by Vieri BARTOLINI
Fast Radio Bursts (FRBs) have emerged as one of the most enigmatic phenomena in modern astrophysics, characterized by their millisecond-duration flashes of extreme luminosity originating from cosmological distances. Despite significant progress in the field, the exact nature and progenitors of FRBs remain elusive. Our group has made substantial advancements in the precise localization of FRBs usin
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Presented by Dr. Benito MARCOTE
on
5 Sep 2024
at
11:00
The angular size − redshift relation for radio galaxies was first discussed by Fred Hoyle at the 1957 Paris Symposium on Radio Astronomy. Unlike for optical measurements of angular size, which are systematically influenced by the effects of redshift and sky brightness, radio measurements of component separations are true metric rods. However attempts to observationally test the predicted depend
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Presented by Dr. Keneth KELLERMANN
on
2 Sep 2024
at
10:15
Session:
Poster Session
With my poster, I will show how to use the CASA/rPICARD pipeline (https://bitbucket.org/M_Janssen/picard) for the calibration of VLBI data. The purpose is to introduce new and interested VLBI users to the automated reduction of VLBI data.
I will also present advantages over traditional calibration methods and current rPICARD use cases. Specifically, I will show how to work with publicly available
... More
Presented by Prof. Michael JANSSEN
Calibration and imaging are closely interconnected in very long baseline interferometry (VLBI). The conventional CLEAN algorithm has been widely employed for imaging, self-calibration, and polarization calibration. However, forward modeling and Bayesian imaging algorithms have recently outperformed CLEAN, and these new imaging methods can also be utilized for various aspects of data calibration. T
... More
Presented by Mr. Jongseo KIM
on
5 Sep 2024
at
16:45
Session:
Poster Session
This study explores the benefits of placing a Very Long Baseline Interferometry (VLBI) transmitter
onboard a next-generation Global Navigation Satellite Systems (GNSS) satellite. Classical VLBI to extra-galactic
radio sources is the only space geodetic technique that can determine all five Earth Orientation parameters (EOPs)
in an absolute sense, including UT1-UTC and Celestial Intermediate Pol
... More
Presented by Prof. Susanne GLASER
We present a multi-wavelength analysis of the gamma-ray emission mechanisms within blazar 3C 454.3. Using 12 years of gamma-ray data alongside multi-epoch VLBA observations at 15 and 43 GHz, we explore the correlation between jet features and gamma-ray activity. Our analysis reveals a significant correlation between gamma-ray flux and core emission at 43 GHz and 15 GHz, suggesting these core regio
... More
Presented by Mrs. Eva PALAFOX
on
4 Sep 2024
at
12:15
The number of gravitational-wave detections approaches the 100 mark and starts revealing the big picture of binary black hole populations. Several detected black holes have mass in the lower (2-5 Msun) or upper (~60-120 Msun) mass gap, challenging models of stellar and binary evolution. Furthermore, evidence for unequal-mass systems and non-negligible spin misalignment advocate for unconventiona
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Presented by Prof. Michela MAPELLI
on
3 Sep 2024
at
09:00
Session:
Poster Session
We present an overview of a proposal for the next generation Space VLBI mission Black Hole Explorer (BHEX). Its main scientific goal is to detect the photon ring and measure basic parameters of super-massive black holes in centers of M87 and SgrA*. Other science cases include black hole demographics as well as studying accretion, formation, and collimation of jets in active galaxies. In order to d
... More
Presented by Prof. Yuri KOVALEV
The discovery of extreme brightness in blazars, made with space VLBI observations, has set new limits on the very high rates of energy release in plasma and a very efficient particle acceleration.
The mounting observational indications for extragalactic neutrino production in blazar-type AGN now begin to deliver key understanding about the physics of proton acceleration in blazars, either nearby
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Presented by Yuri KOVALEV
on
4 Sep 2024
at
09:45
The formation process of high-mass stars (M > 8 Msun) is still unclear; this is mainly due to their fast evolution and large distances that make it very difficult to observe them in detail. However, many observational and theoretical efforts have been made in the last decades that have shed light on some aspects of the formation process. For instance, it has been shown that molecular outflows are
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Presented by Dr. Gabriele SURCIS
on
5 Sep 2024
at
09:00
Nova outbursts are powerful astronomical events occurring in binary star systems, where a white dwarf accumulates material from its companion star until a critical pressure and temperature are reached and trigger a thermonuclear outburst.
In this talk we'll focus on the well known recurrent and symbiotic nova RS Ophiuchi (RS Oph) that experienced a new outburst in August 2021, representing the fi
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Presented by Dr. Rocco LICO
on
4 Sep 2024
at
11:45
The BL Lacerta object OJ287 , located at z = 0.306 is a very unusual object, as it is suspected of hosting a binary black hole system which powers a relativistic blazar jet. New LOFAR observations of this source, reduced including its international baselines, have allowed us to match the resolution of instruments such as the VLA and Chandra, thereby resolving the knots in the kpc jet of OJ287. We
... More
Presented by Dr. Etienne BONNASSIEUX
on
3 Sep 2024
at
17:15
The interplay between the nuclear activity and the interstellar medium (ISM) of galaxies plays an important role in their evolution: the gas accreting onto the dormant supermassive black hole turns it into an active galactic nucleus (AGN) and the ensuing activity is believed to starve the host galaxy of the fuel needed to form stars. The contribution of radio-loud AGN to this feedback effect is ye
... More
Presented by Dr. Suma MURTHY
on
3 Sep 2024
at
09:45
The BRAND receiver is a new system mainly intended for the EVN that covers the remarkably broad contiguous frequency range of 1.5 GHz to 15.5 GHz. It includes all required components of the entire signal path from the cryogenic frontend, feed, amplifiers, hybrids, the 56 Gsps sampler up to the VLBI backend and is intended for VLBI and single-dish work. This band coverage offers flexibility for red
... More
Presented by Mrs. Parisa RAHIMI
on
6 Sep 2024
at
10:15
Blazars are found to cover a broad range in luminosity and the lowest-luminosity objects turn out to be the ones whose spectral energy distribution extends to the highest energies. In the most extreme blazars their spectral energy distribution can peak at very high gamma-ray energies above 10 TeV. These extremely high peaked BL Lac objects typically are faint radio sources and thus make up a poorl
... More
Presented by Mr. Jonas HEßDÖRFER
on
4 Sep 2024
at
10:15
The very long baseline interferometry (VLBI) technique offers unique insights into the structure and dynamics of Gamma-Ray Bursts (GRBs). Specifically, VLBI serves as a fundamental tool for measuring the apparent superluminal expansion (if the GRB is seen on-axis) and proper motion (if the GRB is observed slightly off-axis) of the GRB outflow, enabling constraints on its geometry and characterisat
... More
Presented by Stefano GIARRATANA
on
2 Sep 2024
at
14:45
Session:
Poster Session
In the 2030s, the ESA JUICE and NASA Europa Clipper missions will explore the Jupiter system and provide unprecedented insights into the dynamics of the Galilean satellites. A refined ephemerides estimation will enhance our understanding of their origin and thermal-orbital evolution. However, achieving a robust and consistent solution that matches the low uncertainty levels predicted by current si
... More
Presented by Dr. Giuseppe CIMO
This talk will review the current status of the EVN and some of the developments and enhancements which are already going ahead including adding new telescopes, increasing bandwidth, developing new data processing modes and new correlator hardware, as well as aiming to increase the flexibility of observing in response to evolving scientific demands, especially for transient and multi-messenger as
... More
Presented by Prof. Simon GARRINGTON
on
5 Sep 2024
at
15:30
The Long Baseline Array (LBA) is the only Southern Hemisphere VLBI network, operated as a collaboration between CSIRO, the University of Tasmania, HartRAO, and SpaceOps New Zealand. The LBA has an "open sky" policy and observes for typically 25 days per year, with most of this time scheduled in four or five intensive sessions, interspersed with single observations as required. Most experiments are
... More
Presented by Dr. Chris PHILLIPS
on
6 Sep 2024
at
12:00
Session:
Poster Session
The development of the newer version of the VLBI digital front- and back-end system belonging to the DBBC systems’ family is under way as a work-package of the RadioBlocks Project. This instrument dedicated to increase the VLBI observation capabilities in terms of bandwidth and output data rate involves a number of relevant novelties ranging from the full 32 GHz digitized input band in a number
... More
Presented by Dr. Gino TUCCARI
The European Space Agency's (ESA) large-class mission Jupiter Icy Moons Explorer (JUICE) was launched on 2023 April 14, and started its interplanetary journey towards the Jovian system. The primary science goal of the mission is a complex study of the icy Galilean moons of Jupiter, Ganymede, Europa, and Callisto. One of the eleven scientific experiments of JUICE is the Planetary Radio Interferomet
... More
Presented by Dr. Krisztina PERGER
on
5 Sep 2024
at
14:45
Session:
Poster Session
The TANAMI program has been using the Southern-hemisphere LBA array and associated telescopes to monitor compact relativistic jets in active galactic nuclei (AGN) at X- and K-band frequencies since 2007 with a focus on bright sources (~1Jy) and synergies with the Fermi gamma-ray space telescope. In preparation for the upcoming era of the Cherenkov Telescope Array (CTA) and to exploit the capabilit
... More
Presented by Dr. Jompoj WONGPHECHAUXSORN
Black hole X-ray binaries (BHXBs) are stellar-mass black holes in binary systems with stars, serving as laboratories for studying various astrophysical phenomena such as accretion-outflow mechanisms, jet launching processes, and binary evolution. With approximately 70 known systems in our Galaxy and 2-3 new discoveries annually, most studies focus on systems detected during outbursts when sudden c
... More
Presented by Dr. Pikky ATRI
on
4 Sep 2024
at
11:30
Session:
Poster Session
The high resolution of Very Long Baseline Interferometry (VLBI) allows us to access dynamic aspects of our Universe. However, the data are typically sparse, and certain sources, such as Sgr A*, can change significantly during observations, making traditional snapshot imaging techniques inadequate.
In this talk, I will present how to use the resolve framework for dynamic imaging of VLBI data. This
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Presented by Dr. Jakob KNOLLMÜLLER
Very Long Baseline Interferometry (VLBI) provides high angular resolution images and has been used for stellar astrometry for decades. In the DYNAMO-VLBA project, we utilize the Very Long Baseline Array (VLBA) to study tight binary and multiple pre-main-sequence stars, whose components have detectable radio emission and typical separations on the order of milli-arcseconds. Consequently, Gaia canno
... More
Presented by Jazmín ORDÓÑEZ-TORO
on
5 Sep 2024
at
09:30
The East Asian VLBI Network (EAVN) has been launched as a new international VLBI array in collaboration with four institutes in China, Korea, and Japan in 2018 by expanding capabilities of the KVN and VERA array (KaVA). EAVN collaboration was expanded with inviting three new partner institutes in 2021, resulting in becoming one of the biggest VLBI arrays in the world. Current EAVN consists of 17 r
... More
Presented by Dr. Kiyoaki WAJIMA
on
6 Sep 2024
at
11:15
Small and flexible VLBI arrays, as exemplified by the successful EVN-lite operational model, can produce significant scientific outcomes. INAF, the Italian National Institute of Astrophysics, operates such an interferometer, comprising three dishes with a total collecting area equivalent to an 80m radio telescope and baselines up to 950 km, supported by a software correlator in Bologna. This facil
... More
Presented by Dr. Marcello GIROLETTI
on
6 Sep 2024
at
09:30
In this talk, we will first present the Event Horizon and Environs (ETHER) sample compiled with an extensive sample of black hole masses and radio-to-sub-mm fluxes to select and enhance targets for Event Horizon Telescope (EHT) and next-generation Event Horizon Telescope (ngEHT). Currently, the ETHER database consists of ~3.8 million supermassive black hole (SMBH) mass estimates, ~19.3K VLBI radio
... More
Presented by Dr. Dhanya G. NAIR
on
3 Sep 2024
at
15:15
Session:
Poster Session
The 6.7 GHz methanol maser distribution showing a circular morphology in high-mass star-forming regions was discovered 2 decades ago using a sensitive European VLBI Network. Today, after multi-epoch observations, we derive the proper motions of single-masing cloudlets at the level of several kilometres per second. The motions are directed radially outward from the centres of fillet ellipses indica
... More
Presented by Prof. Anna BARTKIEWICZ
Session:
Poster Session
Relativistic jets from Active Galactic Nuclei (AGN) are suggested to originate from supermassive black holes at the center of galaxies, surrounded by their accretion disks. The properties of the disks are intrinsically linked to the characteristics of the launched jets, in what is known as disk-jet connection. When considering their magnetization, accretion disks fall into two main categories: the
... More
Presented by Dr. Luca RICCI
Session:
Poster Session
High-redshift quasars provide unique information about the formation and evolution of the first galaxies and supermassive black holes (SMBHs) in the early ~1 billion years old Universe. Powerful relativistic jets, hosted by radio quasars, are thought to have an important role in building up SMBHs for such a short period of time. Thanks to dedicated high-resolution VLBI observations, our knowledge
... More
Presented by Mr. Máté KREZINGER
Presented by Anton ZENSUS
on
6 Sep 2024
at
10:30
The European VLBI Network (EVN) has been used in geodesy mode at K band for the purpose of determining the geodetic positions of non-geodetic EVN telescopes (i.e. without S/X receivers). The work was initiated within the context of the EC-funded JUMPING JIVE project (2017-2021). For this purpose, a number of high-quality sources spread over the sky and belonging to the third realization of the Int
... More
Presented by Dr. Patrick CHARLOT
on
5 Sep 2024
at
12:15
HST-1 is a knot in the conical kiloparsec-scale M87 jet, observed for the
first time by the Hubble Space Telescope. In the images, it is the first
the resolved feature near the jet's "core" on the arcsecond scale. HST-1 showed superluminal speeds up to 6c and significant flaring activity in optical and across all bands from radio to X-rays and even gamma-rays. Through the perspective of VLBI, th
... More
Presented by Mr. Aleksei NIKONOV
on
3 Sep 2024
at
16:45
Session:
Poster Session
Herbig Ae/Be stars are pre-main-sequence stars that exhibit distinctive visual emission features as well as infrared excess. Both provide valuable information about the physical conditions, kinematics, and composition of the circumstellar material surrounding the Herbig Ae/Be stars.
The high-resolution (R ∼ 30 000) spectra of V700 Mon and LP Ori were obtained using the échelle spectrograph att
... More
Presented by Dr. Asli ELMASLI
Low-luminosity Active Galactic Nuclei (LLAGN) represent a unique class of AGN in the local universe. Extensive studies on them are essential for a comprehensive understanding of jet physics, as past research has been biased towards powerful radio sources. In this talk, we will present our recent VLBI studies of two prominent nearby LLAGN, NGC 4261 and M104 (the Sombrero galaxy). The presentation w
... More
Presented by Dr. Rusen LU
on
3 Sep 2024
at
12:15
The physics that drives galaxy evolution operates on a large dynamic range of spatial scales and across a wide range of gas phases. The unique perspective enabled by high-resolution radio continuum, polarimetric, and spectral line observations offers important insights not possible in other parts of the electromagnetic spectrum. I will present several examples of this, where SKA precursors/pathfin
... More
Presented by Prof. Roger DEANE
on
2 Sep 2024
at
11:00
Session:
Poster Session
Radio-loud AGNs with their jets pointed close to our line of sight constitute the majority of extragalactic gamma-ray sources and significantly contribute to the radiation observed in the even higher energy regime. The upcoming Cherenkov Telescope Array (CTA) is expected to detect fainter TeV objects, leading to an anticipated increase in the proportion of non-blazar extragalactic high-energy sour
... More
Presented by Dr. Krisztina GABANYI
Session:
Poster Session
Flares on the Sun and other stars result from rapid explosive releases of free magnetic energy stored in the solar/stellar coronae. Solar flares and connected with them coronal mass ejections (CME) have a crucial impact on physical conditions in the near-Earth space, known as “space weather”, and on the functioning of various infrastructure facilities such as communication and navigation syste
... More
Presented by Mr. Vladislavs BEZRUKOVS
The new generation of geodetic Very Long Baseline Interferometry (VLBI), VLBI Global Observing System (VGOS), is now regularly observing to produce the best geodetic VLBI data, with a thermal noise level of about 3 ps. It now approaches to the designed observing strategy, i.e., scan lengths of on average 10 seconds and switching time of about 20 seconds. However, the systematic errors due to the a
... More
Presented by Dr. Ming Hui XU
on
5 Sep 2024
at
14:30
Session:
Poster Session
Magnetic fields surrounding black holes are responsible for a variety of astrophysical phenomena related to accretion processes and relativistic jets. Depending on the source, the strength and configuration of the field lines may differ significantly, which can, in turn, affect the trajectories of charged particles and the corresponding observables. Usually, the magnetic fields around black holes
... More
Presented by Dr. Arman TURSUNOV
Session:
Poster Session
Between December 2023 and April 2024 we conducted a VLBI experiment with LOFAR, NenuFAR, KAIRA and several stations of the LWA to try transatlantic interferometry below 100MHz. Targets were Jupiter (at times of expected decametric bursts) and three bright pulsars. First goal is detecting fringes at all, which was not possible in a smaller experiment more than ten years ago. In the case of success,
... More
Presented by Olaf WUCKNITZ
Session:
Poster Session
A blazar PKS 0735+178 is a potential candidate for emitting high-energy neutrinos through a relativistic jet. Neutrino observatories (e.g., IceCube, Baikal-GVD, etc.) detected neutrino events with energies ranging from GeV to TeV, from the direction of the source in 2021 December. However, the nature of the neutrinos still needs to be clearly understood. Interestingly, multiwavelength flares have
... More
Presented by Mr. Sanghyun KIM
AGN-launched jets are a crucial element in the study of super-massive black holes (SMBH) and their closest surroundings. The formation of such jets, whether they are launched by magnetic field lines anchored to the accretion disc or directly connected to the black hole’s (BH) ergosphere, is the subject of ongoing, extensive research.
3C 84, the compact radio source in the central galaxy NGC 1
... More
Presented by Dr. Georgios-Filippos PARASCHOS
on
3 Sep 2024
at
14:45
Radio galaxies (RGs) are active galactic nuclei (AGN) able to launch relativistic jets, the most energetic phenomena in the Universe, which can have a large impact on galaxy evolution. Current high-sensitivity and high-resolution surveys have shed new light on properties of RGs, particularly in the local Universe (z<0.3) and at low luminosities (<10^24 W/Hz a 1.4 GHz), where the bulk of the AGN po
... More
Presented by Dr. Ranieri D. BALDI
on
2 Sep 2024
at
12:00
Session:
Poster Session
SKA-Low is being constructed in Western Australia and due to become operational in 2027. With a maximum baseline length of 65 Km SKA-Low will be unable to provide high resolution observations on its own, but will have a multi-beam tied array capability allowing it to participate as an element in conventional VLBI arrays. By this means the community will be able to pursue some of the high-sensitivi
... More
Presented by Dr. Cormac REYNOLDS
The next decades of radio astronomy will be dominated by large facilities of superior sensitivity. Between 1GHz and 15GHz, strong synergies can be developed between the next-generation Very Large Array (ngVLA) and the Square Kilometre Array (SKA), specifically the SKA-mid. Towards higher frequencies, the ngVLA will be able to co-observe with other frontline facilities including the EVN (at 1-43 GH
... More
Presented by Prof. Matthias KADLER
on
6 Sep 2024
at
09:45
The Cold Dark Matter (CDM) model for structure formation is currently the most successful at reproducing many observations, but it remains largely untested in the non-linear sub-galactic regime. A clear prediction of this model is that a significant number of low-mass haloes should populate any galaxy and its line of sight. As most of these objects are expected to be completely dark, strong gravit
... More
Presented by Dr. Simona VEGETTI
on
2 Sep 2024
at
09:15
In the past few decades, radio surveys have provided us with unique insights into many areas of astrophysics such as star formation, supernovae, active galactic nuclei, pulsars, cosmology and much more. A key aspect of these surveys is the technique of Very Long Baseline Interferometry (VLBI) which can provide some of the highest resolutions possible in astronomy. This method has been crucial in u
... More
Presented by Dr. Jack RADCLIFFE
on
5 Sep 2024
at
16:30
One of the major open questions related to the production of jets by accreting black holes is: why sources with similar accretion powers produce so vastly different jet powers? What are the conditions that are required to produce a powerful jet? If jets are powered by the Blandford-Zjanek mechanism, there are two obvious parameters controlling the jet power besides the black hole mass - black hole
... More
Presented by Dr. Tuomas K. SAVOLAINEN
on
3 Sep 2024
at
16:00
Active Galactic Nuclei (AGN) generate extreme luminosities, and their central engines have strong magnetic fields and high electron densities which play a major role in the formation of relativistic jets. The Faraday Rotation (FR) MOJAVE project presents resolved polarimetric images of 25 AGN derived from 15/24/43 GHz observations using the Very Long Baseline Array (VLBA). These span across 23 epo
... More
Presented by Dr. Jack LIVINGSTON
on
3 Sep 2024
at
15:00
Session:
Poster Session
Geodetic and astrometric VLBI has entered a new era with the implementation of the VLBI Global Observing System (VGOS, formerly known as VLBI2010). These broadband and dual linear polarization observations aim at an accuracy of station coordinates of 1 mm and a reference frame scale stability of 0.1 mm/year. Although the extended brightness distribution of many of the radio-loud AGN observed durin
... More
Presented by Dr. Frederic JARON
NRAO 150 is a prominent radio to millimetre emitting quasar at redshift $z=1.52$.
This source exhibits a particularly intriguing structure, as the jet is seen at an extremely small angle to the line of sight.
Previous Very Long Baseline Interferometry (VLBI) observations have revealed a fast counter-clockwise rotation of its innermost jet region.
Owing to the high angular resolution provided
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Presented by Lena DEBBRECHT
on
3 Sep 2024
at
17:00
Session:
Poster Session
Formation of super-massive black holes binaries (SMBHB) is one of the most challenging problems of theoretical astrophysics, as well as observational astronomy in electromagnetic and gravitational wave domains. A process of inevitable dissipation of kinetic energy in SMBHB controls the evolution of these objects (also referred to as inspiralling or recoiling) and leads toward coalescing into a sin
... More
Presented by Prof. Leonid GURVITS, Dr. Sándor FREY
Gamma Ray Bursts power highly collimated relativistic jets which shine throughout the electromagnetic spectrum from the radio to the TeV energy range. Short GRBs, produced by the merger of compact binaries hosting at least a neutron star, are key targets to exploit the multimessenger power of combining gravitational waves and electromagnetic observations. I will present the current knowledge of GR
... More
Presented by Dr. Giancarlo GHIRLANDA
on
2 Sep 2024
at
14:00
Neutrinos are a unique and complementary messenger to probe the high-energy universe. I will introduce the currently operating neutrino telescopes, and review what we have learned about the spectrum, flavor composition and sources of astrophysical neutrinos since their discovery in 2013. I will also give a glimpse into the future of the field and the scientific potential of new instrumentation env
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Presented by Dr. Markus ACKERMANN
on
4 Sep 2024
at
09:00
The nearby supernova factory M82 has been intensely studied by e-MERLIN and other radio interferometers over the last 4 decades. The high optical absorption in M82 has prevented study of the supernovae, HII regions and exotic transient objects in this galaxy in optical bands. However, the increased sensitivity from e-MERLIN and the EVN has provided new data and enabled the study of more sources.
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Presented by Dr. David WILLIAMS-BALDWIN
on
3 Sep 2024
at
10:15
Session:
Poster Session
When comparing modern fundamental reference frames in the radio (ICRF) and optical (*Gaia*), a couple of bright radio reference sources appear to have very large radio-optical offsets, from tens up to hundreds of milliarcseconds. The amount of these positional misalignments exceeds the uncertainty of each individual technique by at least an order of magnitude. In most cases, complex and extended r
... More
Presented by Dr. Sándor FREY
Observations of transient and episodic jets allow us to study jet formation and particle acceleration in real time. To better understand the possible physics behind these violent events we perform two-temperature 3D GRMHD simulations of accreting black holes. Our simulations start with an initial torus in hydrostatic equilibrium seeded with a magnetic field with alternating polarity. During the ac
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Presented by Dr. Christian FROMM
on
4 Sep 2024
at
12:00
The Flat Spectrum Radio Quasar PKS 1335-127, situated at a redshift of z=0.539, is among the most extensively studied blazars. This research aims to compare the jet features observed in gamma-rays and radio wavelengths during the 2018 and 2021 observation campaigns by the Event Horizon Telescope (EHT). Notably, a possible flare was detected in June 2020 in gamma-rays, marked by a significant incre
... More
Presented by Ms. Brissa GOMEZ MILLER
Session:
Poster Session
Blazars, a subclass of radio-loud AGN are among the best laboratories for high-energy astrophysics in the Universe. The relativistic jets in blazars are prominent gamma-ray emitters with rapid variablity down to minute scales. The underlying physical mechanisms and origin of the gamma-ray emission, however, are not yet fully understood. One of the key diagnoses for the relevant studies is to explo
... More
Presented by Dr. Daewon KIM
We constructed the Japanese VLBI network VERA (VLBI Exploration of Radio Astrometry) in early 2000s, which consists of four 20-m antennas with the maximum baseline length of 2300 km. The primary goal of VERA was to determine the 3D structure of the Milky Way Galaxy through VLBI astrometry (Honma et al. 2012, 2015), by measuring trigonometric annual parallaxes and proper motions of Galactic radio
... More
Presented by Dr. Tomoya HIROTA
on
6 Sep 2024
at
11:45
Session:
Poster Session
A blazar 3C 454.3 ($z=0.859$) has been extensively investigated in multi-wavelength high-resolution polarization studies, showing polarization variations in milli-arcsecond (mas) scale. We aim to investigate polarimetric characteristics on the blazar 3C 454.3 at 22-129 GHz using decadal (2011-2022) data sets. In addition, we also aim to delve into the origin of the polarization flare in 2019. The
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Presented by Mr. Hyeon-Woo JEONG
Position determination and imaging of bright radio stars by EVN observations using phase-referencing
Session:
Poster Session
Abstract: The VLBI and GAIA observations are on the way to improve the accuracy of celestial reference frame (CRF). Accurate astrometric models of radio stars provide important means to evaluate the consistency between the optical and radio CRFs. This research aims to determine and evaluate the astrometric parameters for the radio stars that have not yet had these parameters determined at radio wa
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Presented by Yertay YESKALI
Cosmic masers enable us to estimate the magnetic field via the Zeeman effect, especially in
high-mass star-forming regions where OH and methanol masers occur. We can measure the
Zeeman-splitting of the maser lines and, knowing the Landé g-factor, determine the strength
of the magnetic field. The g-factor is undoubtedly known for the excited OH maser, but for
methanol masers, it is still under
... More
Presented by Ms. Agnieszka KOBAK
on
5 Sep 2024
at
10:00
Session:
Poster Session
The origin of radio emission in radio-quiet (RQ) active galactic nuclei (AGN) has always been controversial. VLBI observation is crucial for studying the inner radio properties of RQ AGNs. We use the EVN to observe five nearby RQ Seyfert galaxies at 1.7 GHz and 5 GHz. These targets were selected from the Swift/BAT AGNs, with selection criteria of compact single-component structures and peak flux d
... More
Presented by Dr. Ning CHANG
In recent years, evidence has accumulated that some high-energy cosmic neutrinos may be associated with blazars. The strongest evidence for an individual association was found in the case of the blazar TXS 0506+056 which exhibited a major multi-wavelength flare coinciding with an IceCube neutrino event in 2017. A major open question is the production site of neutrinos in blazar jets, especially th
... More
Presented by Florian EPPEL
on
4 Sep 2024
at
10:00
Session:
Poster Session
Current VLBI observations allow us to study collimation in relativistic AGN jets. Among AGNs, radio galaxies provide the unique opportunity to test for jet asymmetry due to their large viewing angle. To better understand the complex interplay between the dynamics of the jet and its environment, we perform numerical simulations of a double sided jet, incorporating realistic ambient profiles as well
... More
Presented by Mrs. Ainara SAIZ PÉREZ
Session:
Poster Session
The formation of relativistic jets from active galactic nuclei remains a subject of intense debate. Despite significant advances in understanding the underlying mechanisms, numerous questions remain. To address them, high-angular-resolution observations performed with the very long baseline interferometry (VLBI) technique are needed.
In this context, we present preliminary results on 4C +01.28 (B
... More
Presented by Luca RICCI
RADIOBLOCKS is a European Commission-funded project that aims to go beyond state-of-the-art technological solutions to increase the sensitivity, field of view and bandwidth of radio astronomy infrastructures. Although these developments address aspects for almost all radio astronomical infrastructures along the entire data chain, VLBI will benefit from their results and deliverables.
RADIOBLOCK
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Presented by Dr. Giuseppe CIMO
on
5 Sep 2024
at
16:15
Session:
Poster Session
Understanding the feedback processes occurring in quasars and the nature of their faint radio emission is needed to reconcile known theories of galaxy formation and AGN evolution. In particular, it is not clear whether the faint radio emission from optically bright quasars is associated with weak jets, ongoing star-formation or another emission process occurring close to the black hole. To shed li
... More
Presented by Ms. Jayde BHANA
Session:
Poster Session
Currently viable dark matter (DM) models, such as the standard cold dark matter (CDM) model and alternative models developed to address its shortcomings - including warm DM, fuzzy DM, and self-interacting DM - differ in their predictions for DM halos at critical sub-galactic scales. If sufficiently dense, these sub-galactic DM halos could form a population of supermassive compact objects (SMCOs).
... More
Presented by Dr. Felix POETZL
Session:
Poster Session
The technique of frequency phase transfer (FPT), pioneered at the Korean VLBI Network, is now gaining strong momentum with a number of telescopes and VLBI arrays considering it as a backbone of future operations. These include, most notably, the Global Millimeter VLBI Array (GMVA) and the upgrade of the Event Horizon Telescope. Implementation of FPT at these instruments holds a promise of increasi
... More
Presented by Andrei LOBANOV
Session:
Poster Session
Pulsars are routinely observed to vary in brightness on timescales of a few minutes due to variations in electron density in the interstellar medium (ISM) on angular scales of several microarcseconds--a process known as scintillation. The only way to unambiguously measure the geometric properties of the ISM structures causing scintillation is with VLBI. However, few VLBI scintillation studies ha
... More
Presented by Ms. Ashley STOCK
The evolutionary stage of a powerful radio source originated by an AGN is thought to be related to its linear size. However, the fraction of young radio sources in flux density-limited samples is much larger than what is expected from the number counts of large radio sources, suggesting the existence of short-lived objects and/or intermittency of jet activity. Determining the incidence of young bu
... More
Presented by Dr. Monica ORIENTI
on
2 Sep 2024
at
12:15
We report results from the first successful simultaneous 22/43 GHz dual-frequency observing campaign with a joint array of the KVN, VERA, and Yebes 40m RT in 2018.
Simultaneous receiving makes it straightforward to apply frequency phase transfer (FPT) and source frequency phase referencing (SFPR) methods, which are essential for overcoming the main challenges of mm-VLBI observations and achievi
... More
Presented by Dr. Guang-Yao ZHAO
on
5 Sep 2024
at
13:30
In 2016, we conducted high-resolution VLBI observations of the blazars 3C 454.3 and OJ287 at 22 GHz, utilizing the space antenna RadioAstron simultaneously with nearly 30 ground-based antennas. These unique observations enabled us to achieve an angular resolution of ~40 microarcseconds, resulting in unprecedented detailed images of the blazars’ inner jet structures. The study of 3C 454.3 reveale
... More
Presented by Dr. Thalia TRAIANOU
on
3 Sep 2024
at
16:15
In recent years, the utilization of the radio spectrum has dramatically increased. Digital telecommunication applications, be it terrestrial cell-phone networks or new-space low-earth orbit satellite constellations, have not only acquired unprecedented amounts of spectrum but also use their frequencies everywhere on Earth. The consequences for radio astronomy and other scientific radio services a
... More
Presented by Dr. Benjamin WINKEL
on
4 Sep 2024
at
13:30
Session:
Poster Session
MOJAVE (Monitoring Of Jets in Active galactic nuclei with VLBA Experiments) is a long-term program to monitor radio brightness and polarization variations in jets associated with active galaxies in the northern sky. It started in 1994 as the 2 cm VLBA survey, introduced polarization measurements in 2002, and is currently approved to continue until 2027.
We monitor more than 60 jets to learn how r
... More
Presented by Yuri KOVALEV
Anomalous flux ratios between lensed images can provide a key test of the dark matter sub-halo population, and hence the properties of dark matter particles. However, the observed anomalous flux ratios at radio frequencies can also be the result of systematics associated with our lack of knowledge about the source structure, source variability, and propagation effects within the lensing galaxy. Re
... More
Presented by Di WEN
on
2 Sep 2024
at
09:45
Presented by Prof. Garrett MIKE A.
on
6 Sep 2024
at
12:15
Session:
Poster Session
TANAMI is the only large and long-term VLBI monitoring program focused on the Southern sky aiming at VLBI monitoring of active galactic nuclei (AGN) at X and K band since 2007, and at S band since 2020. The program concentrates on AGN with very high-energy gamma-ray emission and in recent years the source sample has been extended to accommodate the emerging field of neutrino astronomy as well. Rec
... More
Presented by Mr. Florian RÖSCH
In 2017, the National Astronomical Research Institute of Thailand (NARIT) launched a national flagship project with the empyreal goal of capacity building and technology development through the construction of national radio telescopes for radio astronomy and geodesy. To achieve this, NARIT has established the Thai National Radio Astronomy Observatory (TNRO), in Chiangmai, the northern part of Tha
... More
Presented by Dr. Koichiro SUGIYAMA
on
6 Sep 2024
at
10:00
Session:
Poster Session
We introduce high-cadence monitoring of the M87 jet using EATING VLBI, a joint facility between the East Asia VLBI Network (EAVN) and three Italian telescopes. Currently, EATING VLBI is the only array focusing on regular monitoring of the sub-mas-scale structure of the M87 jet. Here, we present the first images from this program, successfully detecting jet emissions up to $\sim$10 mas from the cor
... More
Presented by Dr. Hyunwook RO
The advent of new generation radio telescopes is opening new possibilities on the classification and study of extragalactic high-energy sources, specially the underrepresented ones like radio galaxies. Among these, Giant Radio Galaxies (GRG, larger than 0.7 Mpc) are among the most extreme mani- festations of the accretion/ ejection processes on supermassive black holes. Our recent studies have sho
... More
Presented by Dr. Gabriele BRUNI
on
2 Sep 2024
at
11:45
The Global Millimetre VLBI Array (GMVA) represents the most extensive array for high-resolution observations at 3.5 mm wavelengths. The mm-VLBI technique has reached a state of maturity and is now delivering cutting-edge results (e.g., the combined image of the black hole shadow and the jet in Messier 87 published by Lu et al. in April 2023). A leap forward is planned with upcoming advancements,
... More
Presented by Prof. Eduardo ROS
on
6 Sep 2024
at
09:00
AGN are expected to influence galaxy evolution through their fast and
powerful outflows which are prominent at radio frequencies, and through
ionizing radiation from their accretion disks through processes termed
broadly as "AGN feedback". The vast majority of AGN are however radio-quiet
and have radio outflows that rarely extend beyond their host galaxies.
In this talk, I will present
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Presented by Prof. Preeti KHARB
on
3 Sep 2024
at
11:00
Session:
Poster Session
Global VLBI observations with baseline lengths of ~10,000km allow detailed imaging at
sub-milliarcsecond resolution at the expense of reduced observation cadence. Given the typical variability of blazars, investigation of flaring AGNs benefits from high cadence and long-term monitoring of targets of interest. Observations with a VLBI array consisting of a smaller number of antennas allow the high
... More
Presented by Mr. Whee Yeon CHEONG
Session:
Poster Session
Active galactic nuclei (AGN) are the most extreme sources of power in the Universe, outshining their entire host galaxies. The Event Horizon Telescope collaboration has successfully imaged supermassive black holes in M87 and SgrA* at event horizon scales, confirming theoretical predictions from general relativity. However, to determine the physical properties of these black holes, precise informa
... More
Presented by Prof. J. Anton ZENSUS
Magnetically active low-mass young stars can produce nonthermal radio emission with brightness temperatures well above 10**6 K, which can be detected with the VLBI technique. The Orion Nebula Cluster (ONC) contains a rich population of young stars, where thousands are low-mass stars. Radio observations have shown that in the core of the ONC about 600 of these low-mass stars are radio emitters. We
... More
Presented by Sergio Abraham DZIB QUIJANO
on
5 Sep 2024
at
09:45
The high angular resolution and sensitivity of VLBI offers a unique tool to identify and study AGN and star-formation activity over cosmic time. VLBI observations are crucial for identifying young radio sources and unveiling older restarted radio sources. Also, radio imaging over a large range of angular scales is needed to determine the role of black hole feedback and jet-induced star formation i
... More
Presented by Célestin HERBÉ-GEORGE
on
2 Sep 2024
at
11:30
Water masers associated with AGNs (the `megamasers') constitute a unique way to directly map the molecular gas at (sub-)parsec distance from SMBHs and, hence, to study the physical properties, the structure, and the kinematics of the gas surrounding the central engine. In particular, high angular resolution radio continuum and maser observations have been used to test the alignment of the radio je
... More
Presented by Dr. Paola CASTANGIA
on
3 Sep 2024
at
11:45
Session:
Poster Session
Quasi-periodic eruptions are repeating burst of X-ray emission, that occur roughly periodically on time intervals of a few hours. Only 6 QPE source were so far detected. While the underlying mechanism for the observed X-ray emission is not fully understood, it is generally believed to be caused be the interaction between a star or stellar remnant with the accretion disk of a super massive black ho
... More
Presented by Sebastiano Daniel VON FELLENBERG
The quasar 3C279 is very well known for its high luminosity, polarization, and variability, has been widely studied and monitored. Recently, the space-VLBI mission RadioAstron revealed a filamentary structure in the jet of this source, offering unprecedented insights into its innermost region. Building on these findings, new data were analyzed four years later at 22 GHz (K-band) using the same mis
... More
Presented by Ms. Teresa TOSCANO DOMINGO
on
3 Sep 2024
at
16:30
We present the results of a pilot observation testing the performance of Frequency Phase Transfer (FPT) and Source/Frequency Phase Referencing (SFPR) at 22 and 43 GHz using the Korean VLBI Network (KVN) and the Yebes-40m telescope in Spain, with a baseline length of $\sim$9,000 km. The ultimate goal of this project is to monitor the orbital motion of supermassive black hole binaries (SMBHBs) using
... More
Presented by Dr. Hyunwook RO
on
5 Sep 2024
at
13:45
Type Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf stars destabilized by mass accretion from a companion star. Despite SNe Ia having been used to unveil the accelerated expansion of the universe, the nature of their progenitors remains poorly understood. To distinguish between a degenerate and non-degenerate progenitor companion, one can use radio observations. A no
... More
Presented by Dr. Javier MOLDON
on
2 Sep 2024
at
15:15
Session:
Poster Session
Single baseline interferometre at VIRAC uses SFXC correlator. This work automated using The Automatic Correlation System (ACor) system. This system is web-based platform which one of the tasks is to automate the correlation and data processing.
The ACor system allows two types of observations to be processed: 1) Data processing with single scan correlation - to experiment with correlation param
... More
Presented by Mr. Jānis ŠTEINBERGS
Session:
Poster Session
We observed four confirmed dual AGNs in Stripe 82 region using VLBA at 5 GHz in multiple-phase-center mode, aiming to study their milliarcsec-scale radio emission properties. In the eight radio components of targets, we detected two pc-scale radio cores labelled J0051+0020B and J2300-0005A. The radio emission of the other six components was resolved out in the high-resolution images. The two VLBA-
... More
Presented by Mr. Wancheng XU
The GLOSTAR galactic plane survey conducted with the VLA and Effelsberg telescopes led to the detection of thousands of compact continuum sources in the Galactic Plane with sizes of less than one arcsecond. We observed 1782 of these compact sources in the galactic longitude range from 28 to 36 degrees with the VLBA to investigate the fraction of sources which are detectable with VLBI and to distin
... More
Presented by Andreas BRUNTHALER
on
5 Sep 2024
at
14:00
The launch of the Gaia mission has paved a way to millisecond-scale optical position measurements, reaching and exceeding accuracy attainable by radio VLBI. These advances do not make radio astrometry obsolete. Instead, multiwavelength measurements open fundamentally new opportunities, impossible with either VLBI or Gaia alone. In this talk, I will explore these opportunities and implications for
... More
Presented by Dr. Alexander PLAVIN
on
5 Sep 2024
at
11:45
We will present astrometric VLBI studies for OH/IR stars conducted with the Japanese VLBI array VERA (VLBI Exploration of Radio Astrometry).
Using several OH/IR stars, we have been explored period-luminosity relation (PLR) in the quite long pulsation period range ($\geq$1000 d).
A preliminary result of the new PLR will be presented.
We will emphasize advantages of VLBI in parallax measuremen
... More
Presented by Dr. Akiharu NAKAGAWA
on
5 Sep 2024
at
14:15
Session:
Poster Session
VLBI technique provides a means to investigate the nature of radio-emitting binary stars on mas or sub-mas scale. In astrometry, high-precision parallax, proper motion, and position measurements could be achieved through VLBI observations, assisting in the revision of our knowledge of the physical parameters of radio-emitting binary stars. Moreover, the binaries being both radio loud and optically
... More
Presented by Dr. Pengfei JIANG
Session:
Poster Session
I will present a new project aiming to increase the number of sources with Very Long Baseline Interferometry (VLBI) astrometry available for comparison with the Gaia results. Using the Very Long Baseline Array, we have observed 31 stars with recently reported radio emission, located <100 pc from the Sun, and all are in the Gaia DR3 catalog. Our first observations yielded 10 detections (a 30% detec
... More
Presented by Sergio Abraham DZIB QUIJANO
Session:
Poster Session
The extragalactic radio sources that make up the International Celestial Reference Frame (ICRF) can exhibit extended and time-variable brightness distributions (or structures) on VLBI scales, setting limits on the accuracy of the astrometric source positions determined from the VLBI measurements. For this reason, the International VLBI Service for Geodesy and Astrometry (IVS) has organized regular
... More
Presented by Dr. Patrick CHARLOT
Very-long-baseline interferometry (VLBI) observations enable us to study the parsec-scale structure of active galactic nuclei (AGN), and connect changes in the jet brightness distribution, morphology, and opacity to the multiwavelength variability exhibited by these sources. In this talk, I will discuss the connection between the radio and gamma-ray variability in the high-redshift blazar, TXS 150
... More
Presented by Petra BENKE
on
2 Sep 2024
at
10:00
Session:
Poster Session
Compact symmetric objects (CSOs) are intrinsically compact extragalactic radio sources and are thought to represent the progenitors of classical radio galaxies.
Several evolutionary models of the radio emission have been developed so far, but they mainly focus on the evolution of high-power jets. Low-power jets are more prone to instabilities than their high-power counterparts, and jet-medium int
... More
Presented by Dr. Filippo D'AMMANDO
Ultra-luminous X-ray sources ([ULXs)][1] are likely powered by stellar-mass objects in the super Eddington accretion phase. In some extreme cases, ULXs might originate from accreting massive or intermediate-mass black holes ([IMBHs][2]). IMBHs are usually located in the nuclear regions of low-mass and low-luminosity dwarf galaxies. Because of accretion activity, ULXs and IMBHs have been well revea
... More
Presented by Jun YANG
on
2 Sep 2024
at
16:00
Does a broad-line region (BLR) wind in radio-quiet (RQ) active galactic nuclei (AGN) extend to pc scales and produce radio emission associated with the BLR wind? We present the results of EVN (including e-MERLIN) observations at 1.7 and 4.9 GHz of ten (six detected) RQ Palomar-Green (PG) quasars, of which five were selected to have CIV blue excess wing and five without. Together with 13 RQ PG quas
... More
Presented by Dr. Sina CHEN
on
3 Sep 2024
at
11:30
X-ray binaries provide nearby laboratories to study the launching and evolution of relativistic jets on human timescales. High angular resolution VLBI observations are critical in determining the motions of these jets, allowing us to track them back to their launch point and determine an ejection time. This can be compared with the contemporaneous X-ray behaviour to determine the causal connection
... More
Presented by Prof. James MILLER-JONES
on
4 Sep 2024
at
11:00
Project Hephaistos recently identified seven M-dwarfs as possible Dyson Spheres (DS) candidates. We cross-matched the sources in archival radio survey catalogues and found that three of these candidates (A, B & G) have radio counterparts. The radio sources are offset from the Gaia stellar positions by ∼ 4.9, ∼ 0.4 and ∼ 5.0 arcseconds (candidates A, B, and G respectively). We proposed (Tongt
... More
Presented by Prof. Michael GARRETT
on
5 Sep 2024
at
11:30