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Two multi-spectral range polarimetric studies on the blazar CTA102 and the blazar-like radiogalaxy 3C120 during gamma-ray flares events

by Dott.ssa Carolina Casadio (Instituto de Astrofisica de Andalucia, CSIC, Granada)

Jun 27, 2014 from 02:00 PM to 03:30 PM

Where Sala Riunioni al II piano dello IASF

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Abstract:

In the era of the Fermi satellite and of the new generation of Cherenkov telescopes, there is an active debate over the location and the mechanisms for the production of MeV to very high energy gamma rays in AGN jets. This can be studied through multi-spectral range polarimetric observations, especially through their correlation during flaring events and comparison with high-resolution VLBI imaging. In this talk I will present two different multi-spectral range studies performed on the quasar CTA102 and the radiogalaxy 3C120. In late 2012 the quasar CTA102 experienced an extraordinary bright gamma-ray outbursts detected by LAT onboard of Fermi, coincident with optical and NIR flares, and the passing of a new superluminal component through the VLBI core. The radiogalaxy 3C120, as other misaligned AGN in the Fermi catalog, is characterized by low gamma-ray flux (F(>0.1GeV)~10^-8 phot cm^-2s^-1). However, two high-state levels were registered at the end of 2008 and 2009 reaching ~ 3-4x10^-8 phot cm^-2 s^-1, as well as between the end of 2012 and the beginning of 2013, in this case in coincidence with an increase of flux from the radio core at 43 GHz.