EGRET Limits on High-Energy Gamma-Ray Emission from X-Ray-- and Low-Energy Gamma-Ray--selected Seyfert Galaxies

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Abstract

view Abstract Citations (44) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS EGRET Limits on High-Energy Gamma-Ray Emission from X-Ray-- and Low-Energy Gamma-Ray--selected Seyfert Galaxies Lin, Y. C. ; Bertsch, D. L. ; Dingus, B. L. ; Fichtel, C. E. ; Hartman, R. C. ; Hunter, S. D. ; Kanbach, G. ; Kniffen, D. A. ; Mattox, J. R. ; Mayer-Hasselwander, H. A. ; Michelson, P. F. ; von Montigny, C. ; Nolan, P. L. ; Schneid, E. ; Sreekumar, P. ; Thompson, D. J. Abstract A sample of 22 Seyfert galaxies, 11 type 1 and two type 2 galaxies selected according to their X-ray fluxes in the AGN survey catalogs of EXOSAT and Ginga, two additional type 1 galaxies for which detections in low-energy gamma rays have been reported in the past, plus six more type 1 galaxies and one unclassified Seyfert that have been studied by the OSSE collaboration, have been examined for high-energy gamma ray emission in observations by the EGRET telescope on the Compton Observatory. No high-energy gamma-ray emission has been detected from any of them. The 2 σ upper limits of the gamma-ray fluxes above 100 MeV for these 22 Seyfert galaxies are given here. The significance of these negative results is discussed. Implications of the EGRET result for NGC 4151 are discussed in more detail. Publication: The Astrophysical Journal Pub Date: October 1993 DOI: 10.1086/187069 Bibcode: 1993ApJ...416L..53L Keywords: GALAXIES: SEYFERT; GAMMA RAYS: OBSERVATIONS full text sources ADS | data products NED (22) SIMBAD (21) HEASARC (1)

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