Extragalactic gamma radiation: Use of galaxy counts as a galactic tracer

Details Extragalactic gamma radiation: Use of galaxy counts as a galactic tracer Extragalactic gamma radiation: Use of galaxy counts as a galactic tracer

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8220109t&link_type=abstract

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Computer Science

Extraterrestrial Radiation, Galactic Structure, Gamma Rays, Intergalactic Media, Compton Effect, Cosmic Rays, Hydrogen, Isotropy, Photons, Tracers

Scientific paper

A derivation of the extragalactic diffuse gamma radiation with energies above 35 MeV was carried out using galaxy counts as a tracer of galactic matter. The extragalactic radiation has a differential photon number spectrum which may be expressed as a power law with index 2.35 (+0.4, -0.3) and an intensity above 35 MeV of (5.5 + or - 1.3) 0.00001 photons sq cm/s/ster, consistent with previous derivations. Use of a 1/sin of the absolute value of b expression of the galactic component produces a poorer fit, suggesting that the high-latitude galactic gamma-ray production may be dominated by cosmic ray interactions with matter rather than by Compton interactions of cosmic rays with photon fields.

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