Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..105s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 1, p.105-108
Astronomy and Astrophysics
Astronomy
29
Cosmic Rays, Galaxies, Gamma Ray Astronomy, Interstellar Magnetic Fields, Magellanic Clouds, Sky Surveys (Astronomy), Gamma Ray Observatory, Gamma Ray Telescopes, Satellite-Borne Instruments, Sodium Iodides
Scientific paper
The data from the Energetic Gamma Ray Experiment Telescope (EGRET) all-sky survey are examined for emission from the nearby galaxies M31, M87, NGC 253, and M82 in the high-energy (E greater than MeV) gamma-ray range. No significant emission is observed from any of these galaxies. The derived upper limits for all four galaxies are consistent with that expected from cosmic-ray interactions. For M87, the combination of the high-energy gamma-ray and radio data point to a lower limit of 7 microG for the magnetic field in the disk and 4 microG for the magnetic field in the halo, consistent with equipartition arguments. A study of NGC 253 and M82 show that EGRET observations do not sufficiently constrain the mean cosmic-ray energy density to provide more details on the cosmic-ray distribution in starburst galaxies.
Bertsch David L.
Dingus Brenda Lynn
Esposito Joseph A.
Fichtel Carl E.
Hartman Robert C.
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