Search For Gamma-Ray Emission From X-Ray-Selected Seyfert Galaxies With Fermi -LAT

Ackermann, M.

doi:10.1088/0004-637X/747/2/104

Title: Search For Gamma-Ray Emission From X-Ray-Selected Seyfert Galaxies With Fermi -LAT

Journal Article · Thu Feb 23 00:00:00 EST 2012 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/747/2/104· OSTI ID:1356759

Ackermann, M. ^[1]

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); et al.

We report on a systematic investigation of the γ-ray properties of 120 hard Xray– selected Seyfert galaxies classified as ‘radio-quiet’ objects, utilizing the threeyear accumulation of Fermi–LAT data. Our sample of Seyfert galaxies is selected using the Swift–BAT 58-month catalog, restricting the analysis to the bright sources with average hard X-ray fluxes F14-195 keV ≥ 2.5 × 10^-11 erg cm^-2 s^-1 at high Galactic latitudes (|b| > 10°). In order to remove ‘radio-loud’ objects from the sample, we use the ‘hard X-ray radio loudness parameter’, RrX , defined as the ratio of the total 1.4 GHz radio to 14 - 195 keV hard X-ray energy fluxes. Among 120 X-ray bright Seyfert galaxies with RrX < 10-4, we did not find a statistically significant γ-ray excess (TS > 25) positionally coincident with any target Seyferts, with possible exceptions of ESO 323–G077 and NGC 6814. The mean value of the 95% confidence level γ-ray upper limit for the integrated photon flux above 100 MeV from the analyzed Seyferts is ≃ 4×10^-9 ph cm^-2 s^-1 , and the upper limits derived for several objects reach ≃ 1 × 10^-9 ph cm^-2 s^-1 . Our results indicate that no prominent γ-ray emission component related to active galactic nucleus activity is present in the spectra of Seyferts around GeV energies. The Fermi–LAT upper limits derived for our sample probe the ratio of γ-ray to X-ray luminosities L /LX < 0.1, and even < 0.01 in some cases. The obtained results impose novel constraints on the models for high energy radiation of ‘radio-quiet’ Seyfert galaxies.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356759

Journal Information:: The Astrophysical Journal, Vol. 747, Issue 2; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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