[SEMINARI] [SEMINAR] C. M üller - Centaurus A's Jet on Subp arsec Scales
Eduardo Ros
Eduardo.Ros en uv.es
Lun Nov 26 09:07:58 CET 2012
Title: Centaurus A's Jet on Subparsec Scales
By: Cornelia Müller
From: Dr. Remeis Observatory Bamberg, University of Erlangen-Nürnberg,
Germany
Where: Seminari del departament d'Astronomia i Astrofísica
Date: Monday November 26th, 2012
Hour: 15:00
Abstract
The radio galaxy Centaurus A is the closest active galactic nucleus
(AGN) at a distance of about 3.8 Mpc. Due to its proximity, Cen~A is
a key target for studying extragalactic jets at the highest possible
spatial resolution. Multi-epoch Very Long Baseline Interferometry
(VLBI) observations of Cen A conducted in the framework of the TANAMI
program (Tracking Active Galactic Nuclei with Austral Milliarcsecond
Interferometry) offer an exceptional opportunity to study this AGN on
a linear scale as small as 15 milliparsec. TANAMI is a monitoring
program observing a sample of jets south of -30deg declination with
the Australian Long Baseline Array (LBA) and associated telescopes in
South Africa, Chile and Antarctica approximately every three months at
8GHz and 22GHz. With the first epoch TANAMI dual-frequency images of
Cen A at an angular resolution of about (0.7x0.4)mas, we can construct
the best resolved spectral index map of its sub-parsec scale jet-
counterjet system. We can identify multiple possible sites as the
origin of gamma-ray emission detected by Fermi/LAT. In addition, the
multi-epoch high resolution TANAMI images allow us to perform a very
detailed jet kinematic analysis, tracking individual components of sub-
parsec scale size and revealing a complex jet flow. Investigating the
gamma-ray/radio connection in Cen A is crucial for our understanding
of the formation and broadband emission mechanism of extragalactic jets.
__________________________________________
Prof. Dr. Eduardo Ros
Associate Professor for Astrophysics
Dept. of Astronomy, University of Valencia
E-46100 Burjassot, Valencia - SPAIN
Tel: +34-9635-43073
Fax: +34-9635-43084
http://www.uv.es/eros/
mailto:Eduardo.Ros en uv.es
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