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The Third EGRET Catalog of High-Energy Gamma-Ray Sources

P. SreekumarCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771S. D. HunterCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771P. L. NolanCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771D. L. BertschCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771Y. C. LinNAS-NRC Research AssociateW. F. TompkinsUSRA Research AssociateJ. A. EspositoCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771Deines-Jones, P.Raytheon STXA. ChenCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771G. KanbachMax-Planck-Inst. fuer Extraterrestrische Physik Garching, GermanyL. M. McDonaldCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771S. D. BloomCode 661, NASA Goddard Space Flight Center, Greenbelt, MD 20771D. P. FriedlanderW. W. Hansen Experimental Physics Laboratory and Department of Physics, Stanford University, Stanford CA 94305Muecke, A.W. W. Hansen Experimental Physics Laboratory and Department of Physics, Stanford University, Stanford CA 94305C. E. FichtelW. W. Hansen Experimental Physics Laboratory and Department of Physics, Stanford University, Stanford CA 94305D. J. ThompsonW. W. Hansen Experimental Physics Laboratory and Department of Physics, Stanford University, Stanford CA 94305B. B. JonesStanford Univ. Stanford, CA United StatesR. C. HartmanNASA Goddard Space Flight Center Greenbelt, MD United StatesP. F. MichelsonMax-Planck-Institut für Extraterrestrische Physik, D-85748 Garching, GermanyMayer-Hasselwander, A.Present address: University of Adelaide, Department of Physics and Mathematical Physics

ABI

Аннотация

The third catalog of high-energy gamma-ray sources detected by the EGRET telescope on the Compton Gamma Ray Observatory includes data from 1991 April 22 to 1995 October 3 (Cycles 1, 2, 3, and 4 of the mission). In addition to including more data than the second EGRET catalog and its supplement, this catalog uses completely reprocessed data (to correct a number of mostly minimal errors and problems). The 271 sources (E greater than 100 MeV) in the catalog include the single 1991 solar flare bright enough to be detected as a source, the Large Magellanic Cloud, five pulsars, one probable radio galaxy detection (Cen A), and 66 high-confidence identifications of blazars (BL Lac objects, flat-spectrum radio quasars, or unidentified flat-spectrum radio sources). In addition, 27 lower-confidence potential blazar identifications are noted. Finally, the catalog contains 170 sources not yet identified firmly with known objects, although potential identifications have been suggested for a number of those. A figure is presented that gives approximate upper limits for gamma-ray sources at any point in the sky, as well as information about sources listed in the second catalog and its supplement which do not appear in this catalog.

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