FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MISALIGNED ACTIVE GALACTIC NUCLEI

By A. Abdo, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji and 165 more. 2010

145 citations recorded by the source corpus.

Analysis is presented for 15 months of data taken with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope for 11 non-blazar active galactic nuclei (AGNs), including seven FRI radio galaxies and four FRII radio sources consisting of two FRII radio galaxies and two steep spectrum radio quasars. The broad line FRI radio galaxy 3C 120 is reported here as a γ-ray source for the first time. The analysis is based on directional associations of LAT sources with radio sources in the 3CR, 3CRR, and MS4 (collectively referred to as 3C-MS) catalogs. Seven of the eleven LAT sources associated with 3C-MS radio sources have spectral indices larger than 2.3 and, except for the FRI radio galaxy NGC 1275 that shows possible spectral curvature, are well described by a power law. No evidence for time variability is found for any sources other than NGC 1275. The γ-ray luminosities of FRI radio galaxies are significantly smaller than those of the BL Lac objects detected by the LAT, whereas the γ-ray luminosities of the FRII sources are quite similar to those of FSRQs, which could reflect different beaming factors for the γ-ray emission. A core dominance (CD) study of the 3CRR sample indicates that sources closer to the jet axis are preferentially detected with the Fermi LAT, insofar as the γ-ray-detected misaligned AGNs have larger CD at a given average radio flux. The results are discussed in view of the AGN unification scenario.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/450b6fd3c0f81ee247dfdbeef096162e5b80f843

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Citations in the corpus

SPECTROSCOPY OF BROAD-LINE BLAZARS FROM 1LAC (2012, methodology): “The Fermi LAT First Source Catalog (Abdo et al. 2010a, 1FGL) catalogs the 1451 most significant sources detected in Fermi’s first year of operation.”
THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2015, methodology): “All the 1FGL sources, detected in 11 months of exposure, were subsequently studied with 15 months of data (Abdo et al. 2010e).”
CONTRIBUTION OF GAMMA-RAY-LOUD RADIO GALAXIES’ CORE EMISSIONS TO THE COSMIC MeV AND GeV GAMMA-RAY BACKGROUND RADIATION (2011, methodology): “Their average photon index at 0.1–10 GeV is ∼2.4, which is the same as that of the GeV EGRB (Abdo et al. 2010e) and blazars (Abdo et al. 2010f).”
BLAZARS AS ULTRA-HIGH-ENERGY COSMIC-RAY SOURCES: IMPLICATIONS FOR TeV GAMMA-RAY OBSERVATIONS (2011, methodology): “VHE BLAZARS AND UHECRS Of the wide variety of source classes that could potentially accelerate UHECRs, including, for example, GRBs (Waxman 1995; Vietri 1995; Murase et al. 2008a), fast rotating magnetars (Arons 2003), structure formation shocks in galaxy clusters (Norman et al. 1995; Kang et al. 19”
THE LUMINOSITY FUNCTION OF FERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS (2011, methodology): “This is done in order to reproduce the inherent systematic uncertainty of ﬁtting the curved spectrum of a source with a power law (Abdo et al. 2010a).”
THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2010, methodology): “This source is associated with M82, also known as NGC 3034 and 3C 231, a starburst galaxy previously detected by the LAT (Abdo et al. 2010d).”
GeV OBSERVATIONS OF STAR-FORMING GALAXIES WITH THE FERMI LARGE AREA TELESCOPE (2012, methodology): “…by harder gamma-ray spectra relative to quiescent galaxies of the Local Group (Acero et al. 2009; Acciari et al. 2009; Abdo et al. 2010a; Ohm et al. 2011), and that global gammaray luminosities of galaxies likely scale quasi-linearly with SFRs (e.g. Abdo et al. 2010a,d; Lenain & Walter 2011).”
FROM THE BLAZAR SEQUENCE TO THE BLAZAR ENVELOPE: REVISITING THE RELATIVISTIC JET DICHOTOMY IN RADIO-LOUD ACTIVE GALACTIC NUCLEI (2011, methodology): “An explanation is given by Garofalo et al. (2010) for the presence of these mixed-type AGN based on black hole spin − namely, that central black holes with high retrograde spins and efficient accretion will produce powerful HERG FR IIs, which slowly spin down to progradespinning, low efficiency FR I”