Fermi/LAT Observations of Swift/BAT Seyferts: on the Contribution of Radio-quiet AGN to the Extragalactic Gamma-ray Background

Abstract

We present the analysis of 2.1 years of Fermi/LAT data on 491 Seyfert galaxies detected by the Swift/BAT survey. Only the two nearest objects, NGC 1068 and NGC 4945, which were identified in the Fermi First-year Catalog, are detected. Using the Swift/BAT and radio 20 cm fluxes, we define a new radio-loudness parameter $R_{X,BAT}$ where radio loud objects have $\log R_{X,BAT}>-4.7$. Based on this parameter, only radio loud sources are detected by Fermi/LAT. An upper limit to the flux of the undetected sources is derived to be $\sim 2\times 10^{-11}$ photons cm${}^{-2}$ s${}^{-1}$, approximately seven times lower than the observed flux of NGC 1068. Assuming a median redshift of 0.031, this implies an upper limit to the $\gamma$-ray (1--100 GeV) luminosity of $\lesssim 3\times 10^{41}$ erg s${}^{-1}$. In addition, we identified 120 new Fermi/LAT sources near the Swift/BAT Seyferts with significant Fermi/LAT detections. A majority of these objects do not have \bat counterparts, but their possible optical counterparts include blazars, FSRQs, and quasars.

19 pages preprint style, including 2 tables and 4 figures. Accepted for publication by the Astrophysical Journal

References in corpus (13)

• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• Roma-BZCAT: A multifrequency catalogue of Blazars
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• The Spitzer Spirals, Bridges, and Tails Interacting Galaxy Survey: Interaction-Induced Star Formation in the Mid-Infrared
• Calibration of [O IV] 26 micron as a Measure of Intrinsic AGN Luminosity
• The first gamma-ray outburst of a Narrow-Line Seyfert 1 Galaxy: the case of PMN J0948+0022 in July 2010
• Seyfert 2 galaxies in the GeV band: jets and starburst
• The radio/gamma-ray connection in Fermi-blazars
• The Cosmic MeV Gamma-ray Background and Hard X-ray Spectra of Active Galactic Nuclei: Implications for the Origin of Hot AGN Coronae
• Tools for computing the AGN feedback: radio-loudness distribution and the kinetic luminosity function

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