[SEMINARI] NOW ! - [SEMINAR] C. M üller - Centaurus A's Jet on Subp arsec Scales

[Eduardo Ros]

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> From: Eduardo Ros <ros en MPIFR-BONN.MPG.DE>
> Date: November 26, 2012 8:58:28 AM GMT+01:00
> To: DAASEMINARS en listserv.uv.es
> Subject: [SEMINAR] C. Müller - Centaurus A's Jet on Subp arsec Scales
> Reply-To: Seminaris i activitats del departament de Astronomia i  
> Astrofisica <DAASEMINARS en listserv.uv.es>
>
> 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.

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