The gamma-ray sky is dominated by AGN characterized by extreme properties. These sources (i.e. Blazars, including BL LAC and Flat Spectrum Radio Quasars) are characterized by irregular rapid variability, high polarization, core dominant radio morphology, apparent superluminal motion and non-thermal continuum extended from radio up to gamma-rays. These properties can be explained assuming that a jet oriented to the observer is ejected by the central region of massive elliptical galaxies.
Thanks to the excellent Fermi performance, new sources have been detected during the first year of satellite operations. Among these, a very interesting class consists of Radio Galaxies, objects with jets pointed at large angles of view.
Some works in the past suggested RGs as possible gamma-ray emitters (Ghisellini et al. 2005, A&A 432, 401: Grandi & Palumbo 2007, APJ 659, 235).
As discussed in the mentioned papers, the study of this high energetic phenomena in de-aligned AGN, is of enormous importance to understand the jet structure, the mechanism by which the jets form and the efficiency with which the energy associated with material entering the accretion radius is converted in jet power.

Activity: In collaboration with the Fermi team, the PhD thesis will focus on the identification of RGs by cross-correlation of gamma sources with radio catalogues (3C, 2Jy, First, Texas..). As an optical classification of the Radio Galaxies is also necessary, in case no data are available in literature, requests of observations will be submitted to optical telescopes . Once the sources are identified, X-ray and multifrequency studies will be performed to provide a Spectral Energy Distribution (SED ) of each detected Gamma-ray RGs. The SEDs will be successively compared with the current models proposed to explain the non-thermal emission in non blazar AGN.



Project web page:TBD

IASF BO tutor: Paola Grandi/Eleonora Torresi