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24 March 2025
Europe/Berlin timezone
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Contribution List
Displaying 17
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17
Session:
Session II
In describing the variability of blazars, "multiplicity" seems to be an essential keyword. Multiple are the processes that generate the flux density variations observed in blazars' light curves: to disentangle them, it is necessary to perform multi-frequency studies over multiple ranges of timescales. In this talk, I will discuss different aspects of the study of blazars through the characterisati
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Presented by Dr. Nicola MARCHILI
on
24 Mar 2025
at
17:20
Session:
Session II
In this presentation, I will recall my PhD studies on Intraday Variability (IDV) and interstellar scintillation. My doctoral research in Bonn will be the starting point for a journey that continues today with observations of spacecraft signal scintillation and its applications to solar physics and the solar wind. From single-dish and VLBI analyses of the rapid variability of Active Galactic Nuclei
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Presented by Dr. Giuseppe CIMO
on
24 Mar 2025
at
16:40
Session:
Session I
Science advances not only through research but also through the guidance of dedicated mentors. One such mentor is Thomas Krichbaum, whose guidance has shaped many scientific careers. As he approaches retirement, this talk honors his invaluable mentorship and foundational contributions to very-long-baseline interferometry (VLBI) and jet physics.
In my doctoral research with Thomas, I used cutting-
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Presented by Dr. Thalia TRAIANOU
on
24 Mar 2025
at
14:20
Session:
Session II
Active Galactic Nuclei (AGNs) are thought to influence galaxy formation and evolution through their energetic radio jet outflows, yet observational evidence on jet triggering and feedback mechanisms remains limited. Studying the continuum radio jet and circumnuclear gas in AGNs with high-resolution Very Long Baseline Interferometry (VLBI) is essential to probe accretion environments and jet feedba
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Presented by Mr. Dongjin KIM
on
24 Mar 2025
at
16:05
Session:
Session I
Over the past several years, I have been attempting to measure distances to blazars by using the speed of light to calibrate a standard ruler. Archival data is not well suited to this kind of experiment, so by teaming up with geodetic VLBI astronomers, I have been performing weekly global VLBI using the KVN, Mopra and HartRAO. I present early results and progress in the context of hints of a time
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Presented by Mr. Jeffrey HODGSON
on
24 Mar 2025
at
14:35
Session:
Session I
Multi-wavelength observations are key to understanding cosmic phenomena. When combined with VLBI data, high-energy observations have helped us explore emission sites and processes in more detail. This talk will highlight how Thomas’s contributions have deepened our understanding of AGN and their role in the broader high-energy astrophysical context.
Presented by Dr. Bindu RANI
on
24 Mar 2025
at
14:00
Session:
Session I
Very Long Baseline Interferometry (VLBI) has revolutionized our ability to image nearby supermassive black holes with unprecedented resolution. As we celebrate the remarkable career of Dr. Thomas Krichbaum, this talk reflects on our close collaboration in exploring the immediate surroundings of these “cosmic monsters”. From VLBI monitoring studies of Sgr A* to the first-ever imaging of M87’s
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Presented by Dr. Rusen LU
on
24 Mar 2025
at
13:20
Session:
Session I
Over the years, our understanding of active galactic nuclei (AGN) has been significantly advanced through high-resolution observations enabled by very-long-baseline interferometry (VLBI). Under the mentorship of Thomas, our work has focused on high-frequency VLBI imaging of γ-ray active AGN jets, probing their structure, variability, and dynamics at the highest angular resolutions. By utilising g
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Presented by Georgios-Filippos PARASCHOS
on
24 Mar 2025
at
14:55
Session:
Session II
Although more than 50 years old, the 100m-telescope at Effelsberg is still in perfect condition,
as it has been continuously maintained and modernized during the past decades. Hence, it is heavily involved in various kinds of astronomical research, using the telescope as a stand-alone instrument („single-dish“) as well as in several VLBI networks.
Here, we report on the developments in the
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Presented by Alex KRAUS
on
24 Mar 2025
at
16:20
Session:
Session II
In my talk I would like to give an overview of the multi-wavelength variability studies of Sgr A* as they have been carried out for about 20 years now. In particular, I will describe the evolution of the analytical tools and Thomas' role in their development. I conclude with some personal remarks about the 35 years that Thomas and I have known each other.
Presented by Dr. Gunther WITZEL
on
24 Mar 2025
at
17:40
Session:
Session I
The first millimetre VLBI observations of the supermassive black hole of the Galactic Centre, Sagittarius A*, have provided an unprecedented insight into the extreme physics of strong gravity. In this talk, I will discuss the early pioneering efforts that paved the way for resolving the shadow of Sgr A*, highlighting key developments in millimeter-wave very long baseline interferometry (VLBI) and
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Presented by Prof. Heino FALCKE
on
24 Mar 2025
at
13:00
Session:
Session II
The NOrthern Extended Millimeter Array started out in the 1980s as an
ambitious project to build a millimeter interferometer on the Plateau
de Bure, France. First observations in single-dish mode demonstrated
the potential of the instrument; a first phased array mode became
available in late 2002 until 2017. After a short return to single dish
mode the present large-band NOEMA phased array mo
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Presented by Dr. Michael BREMER
on
24 Mar 2025
at
15:45
Session:
Session II
Large fraction of flat spectrum radio quasars show at cm wavelengths fast variability, called Intraday Variability (IDV). IDV is mainly explained as the result of propagation effect caused by interstellar scattering of radio waves in the turbulent, ionised interstellar matter of the Milky Way. The annual modulation of the variability timescale, caused by the Earth motion around the Sun, observed i
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Presented by Dr. Krisztina GABANYI
on
24 Mar 2025
at
17:00
Session:
Session I
A significant fraction of active galactic nuclei (AGNs) exhibit structured relativistic jets along with rapidly variable and luminous electromagnetic emissions ranging from radio waves to gamma rays. Although many theoretical models propose that mass accretion onto central supermassive black holes (SMBHs) is the ultimate energy source powering AGNs, the detailed physical processes governing the st
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Presented by Prof. Jae-Young KIM
on
24 Mar 2025
at
13:40
