Results from the energetic gamma-ray experiment telescope on the Compton gamma-ray observatory

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galactic Nuclei, Bl Lacertae Objects, Gamma Ray Astronomy, Gamma Ray Bursts, Magellanic Clouds, Milky Way Galaxy, Pulsars, Quasars, Solar Flares, Cosmic Rays, Diffuse Radiation, Gamma Ray Observatory, Gamma Ray Spectra, Radio Spectra, Seyfert Galaxies

Scientific paper

The energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (CGRO) has the capability of exploring the high energy plasma gamma ray range from approximately 30 MeV to 30 GeV with a sensitivity considerably greater than earlier gamma-ray satellite telescopes. The dominant radiation from the high energy gamma ray sky is the diffuse radiation along the galactic plane. Thus far, five pulsars have been detected and their properties measured. The high energy gamma rays appear to be an increasing fraction of the total emitted electromagnetic radiation as the age of the pulsar increases up to one million years. Observations of one solar flare event showed that there was strong evidence for long-term trapping of relativistic solar nuclei in the solar vicinity for at least 10 hours. Regarding the gamma ray bursts of unknown origin, high energy gamma rays have been seen following a burst for over an hour, with energies in the GeV range and even higher in the case of two individual gamma rays. The observation of the Small Magellanic Cloud appears to answer finally the long open question of whether the bulk of the cosmic rays are galactic or pervade some much larger volume on the side of their being galactic. Over 30 Active Galactic Nuclei (AGN's) have been seen in high energy gamma rays with high probability thus far including quasars and BL Lac objects, but no Seyfert galaxies. Time variations have been detected in many of these AGN's.

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