2-6 September 2024
CJD Bonn Castell
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Session VIII: Nuclei of radio loud AGN II -- Chair: Michael Janssen

Place

Location: CJD Bonn Castell
Address: Graurheindorfer Str. 149, 53117 Bonn
Date: 3 Sep 16:00 - 17:30

Description

6x 15min Contributed Talk

Timetable | Contribution List

Displaying 7 contributions out of 7
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 3/9/2024 at 17:15
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 3/9/2024 at 16:45
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 3/9/2024 at 16:00
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 ... More
Presented by Lena DEBBRECHT on 3/9/2024 at 17:00
The radio and millimeter-wavelength emission of Sagittarius A∗ (Sgr A∗) is well-described as partially self-absorbed synchrotron radiation. Persistent time-lags have been observed in the Sgr A∗ light curves from observations spanning the frequency range from 47 GHz to 19 GHz, suggesting the presence of expanding hot plasma. However, distinguishing between an organized outflow (jet) and local ... More
Presented by Mrs. Noemi LA BELLA
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 3/9/2024 at 16:15
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 3/9/2024 at 16:30
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