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Results from the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Observatory |
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| Authors: | C E Fichtel D L Bertsch B Dingus R C Hartman S D Hunter G Kanbach D A Kniffen P W Kwok Y C Lin J R Mattox H A Mayer-Hasselwander P F Michelson C von Montigny P L Nolan K Pinkau H Rothermel E J Schneid M Sommer P Sreekumar D J Thompson |
| Institution: | 1 NASA/Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA 2 Max-Planck Institut für Extraterrestrische Physik, D/W8046 Garching, Munich, Germany 3 Hansen-Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA 4 Grumman Aerospace Corporation, Mail Stop A01-26, Bethpage, NY 11714, USA 5 Hampden-Sydney College, P.O. Box 862, Hampden-Sydney, VA 23943, USA 6 Compton Observatory, Science Support Center, Computer Sciences Coporation, Code 668.1, NASA/GSFC, USA 7 USRA Research Associates, NRC Resident Research Associate, USA 8 NRC Resident Research Associate, USA |
| Abstract: | The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory covers the high energy gamma ray energy range, approximately 30 MeV to 30 GeV, with a sensitivity considerably greater than earlier high energy gamma-ray satellites. Thus far, 4 pulsars have been detected and their properties measured, including in 3 cases the energy spectrum as a function of phase. The details of the galactic plane are being mapped and a spectra of the center region has been obtained in good agreement with that expected from cosmic ray interactions. The Magellanic clouds have been examined with the Large Magellanic Cloud having been detected at a level consistent with it having a cosmic ray density compatible with quasi-stable equilibrium. Sixteen Active Galactic Nuclei (AGN's) have been seen thus far with a high degree of certainty including 12 quasars and 4 BL Lac objects, but no Seyferts. Time variation has been detected in some of these AGN's. |
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