<i>FERMI</i>LARGE AREA TELESCOPE OBSERVATIONS OF MISALIGNED ACTIVE GALACTIC NUCLEI

Abstract

Analysis is presented on 15 months of data taken with the Large Area\nTelescope (LAT) on the Fermi Gamma-ray Space Telescope for 11 non-blazar AGNs,\nincluding 7 FRI radio galaxies and 4 FRII radio sources consisting of 2 FRII\nradio galaxies and 2 steep spectrum radio quasars. The broad line FRI radio\ngalaxy 3C 120 is reported here as a gamma-ray source for the first time. The\nanalysis is based on directional associations of LAT sources with radio sources\nin the 3CR, 3CRR and MS4 (collectively referred to as 3C-MS) catalogs. Seven of\nthe eleven LAT sources associated with 3C-MS radio sources have spectral\nindices larger than 2.3 and, except for the FRI radio galaxy NGC 1275 that\nshows possible spectral curvature, are well described by a power law. No\nevidence for time variability is found for any sources other than NGC 1275. The\ngamma-ray luminosities of FRI radio galaxies are significantly smaller than\nthose of BL Lac objects detected by the LAT, whereas the gamma-ray luminosities\nof FRII sources are quite similar to those of FSRQs, which could reflect\ndifferent beaming factors for the gamma-ray emission. A core dominance study of\nthe 3CRR sample indicate that sources closer to the jet axis are preferentially\ndetected with the Fermi-LAT, insofar as the gamma-ray--detected misaligned AGNs\nhave larger core dominance at a given average radio flux. The results are\ndiscussed in view of the AGN unification scenario.\n