The Inverse-Compton and Extragalactic Components of the Diffuse Gamma-Ray Emission

Details The Inverse-Compton and Extragalactic Components of the Diffuse Gamma-Ray Emission The Inverse-Compton and Extragalactic Components of the Diffuse Gamma-Ray Emission

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.5803c&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #58.03; Bulletin of the American Astronomical Society, Vol. 27, p.1368

Astronomy and Astrophysics

Astronomy

Scientific paper

We present spectra of the inverse-Compton and extragalactic components of the high-energy gamma-radiation based on an analysis of the emission at high galactic latitudes ( | b | >= 30deg ). We correlate the gamma-ray intensity with a model consisting of an isotropic component, a component proportional to the 408 MHz synchrotron radiation, and a component proportional to atomic hydrogen (H I) column density with different emissivities in eight galactic octants. The spectrum of gamma-radiation that is correlated with the H I column density indicates that this component originates in cosmic-ray/matter interactions. The cosmic-ray electrons which produce the 408 MHz radio continuum emission also produce gamma-radiation through inverse-Compton interactions with interstellar photons. By correlating the gamma-radiation with the 408 MHz continuum, we measure the spectrum and absolute intensity of the IC emission. The isotropic component gives us the spectrum and intensity of the extragalactic gamma-radiation. We discuss interpretation of the extragalactic spectrum. This work was supported in part by NASA Grant NAG 5-2235.

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