[SEMINARI] High resolution studies of AGN: CTA102 and others, Christian M. Fromm

Enric Marco Enric.Marco en uv.es
Lun Feb 22 14:35:49 CET 2010


High resolution studies of AGN: CTA102 and others

Christian M. Fromm

Max-Planck-Institut fuer Radioastronomie, Bonn, Alemanya

Seminari del Departament d'Astronomia i Astrofisica

Dimecres 03 març 2010

Hora: 15:00

Resum

Important information can be obtained from radio observations of active 
galactic nuclei (AGN), including single-dish light-curve analysis and 
multi-frequency very-long-baseline interferometry (VLBI) observations. 
We will present our study of the historical 2006 radio flare in the 
radio source CTA 102, where the shock-in-jet model and the hypothesis of 
an over-pressured jet during this flare were tested. For our analysis, 
we used single-dish observations as well as three multi-frequency VLBI 
observations. From the light curve analysis we identify the three 
different radiation loss stages, where the synchrotron stages shows a 
unexpected double peak structure. The evolution of the spectral 
parameters along the jet during the flaring event are extracted from 
VLBI observations and confirm our assumed model. The double peak 
structure can be explained by a change in the viewing angle and leads to 
a Doppler boosting of the flux densities around 2006.1. Prospectives of 
numerical simulations and studies on another sources will be presented 
as well.

-- 
/------------------------------------\
 Dr. Enric Marco
 Departament d'Astronomia i Astrofísica
 Facultat de Física
 Universitat de València
 C/  Dr. Moliner, 50
 46100 Burjassot, Spain
 Phone: (34)-96-354-3069
 Fax:(34)-96-354-3084
 enric.marco en uv.es
 http://www.uv.es/marco
 http://www.uv.es/aulaastronomia
 http://www.uv.es/daa
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