Torresi, Eleonora

Jet evolution in Steep Spectrum Radio Quasars. A multiwavelength study.

 Author list: E. Torresi, P. Grandi, the TANGO team on behalf of the Fermi-LAT collaboration and A. De Rosa

Thanks to the Fermi gamma-ray satellite, it is now confirmed that Misaligned Active Galactic Nuclei (MAGN), i.e. radio galaxies and  steep spectrum radio quasars, are a new class of GeV emitters.  Similarly to blazars, one of the most intriguing aspects of MAGN  is the localization of the high-energy dissipation region (at  sub-pc or pc-scale), that turns out to be an important ingredient  for theoretical models. In this context, we will discuss the  results obtained from a radio to gamma-ray study of the two steep  spectrum radio quasars belonging to the MAGN sample, i.e. 3C 207 and 3C 380. Part of these data have been collected within the TANGO (Timing Analysis of Non blazar Gamma-ray Objects)  multi frequency project that aims at studying the temporal evolution of MAGN jets.  From the gamma-ray variability and the comparison of flaring periods at different wavelengths, the physical size of the high-energy emitting zone and its energetics can be estimated.  Possible locations of such region are also discussed.