Gamma Rays from Radio Galaxies: FERMI/LAT Observations
Abstract
We review the high energy properties of Misaligned AGNs associated with γ-ray sources detected by Fermi in 24 months of survey. Most of them are nearby emission low power radio galaxies (i.e FRIs) which probably have structured jets. On the contrary, high power radio sources (i.e FRIIs) with GeV emission are rare. The small number of FRIIs does not seem to be related to their higher redshifts. Assuming proportionality between the radio core flux and the γ-ray flux, several of them are expected to be bright enough to be detected above 100 MeV in spite of their distance. We suggest that beaming/jet structural differences are responsible for the detection rate discrepancy observed between FRIs and FRIIs.
- Publication:
-
International Journal of Modern Physics Conference Series
- Pub Date:
- 2012
- DOI:
- 10.1142/S2010194512004370
- arXiv:
- arXiv:1112.2505
- Bibcode:
- 2012IJMPS...8...25G
- Keywords:
-
- gamma rays: observations;
- galaxies: active;
- galaxies: jets;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- To be published in the proceedings of High Energy Phenomena in Relativistic Outflows III (HEPRO III, IJMPCS)