[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
------------------------------------------

------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: http://pegaso.ific.uv.es/pipermail/seminari/attachments/20121126/a8bcb18b/attachment.htm


Más información sobre la lista de distribución Seminari