SMM Measurement of the Isotropic Cosmic Gamma-Ray Background

Details SMM Measurement of the Isotropic Cosmic Gamma-Ray Background SMM Measurement of the Isotropic Cosmic Gamma-Ray Background

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0601w&link_type=abstract

American Astronomical Society, HEAD meeting #4, #06.01; Bulletin of the American Astronomical Society, Vol. 31, p.702

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Scientific paper

Given the Solar Maximum Mission Gamma-Ray Spectrometer's nine years of exposure and large field of view, its data contains a tremendously significant signal from the isotropic cosmic gamma-ray background (CGB) in the energy range 0.3 - 8.0 MeV. We have extracted this signal by modelling its modulation by the Earth s motion through its field of view, along with several other background components. We can quantify the success of the technique and evaluate possible systematic errors because the true CGB should be constant in time and we have many independent measurements, and because all known other background components have narrow lines in them that should not be present in the CGB. We present the results of our measurement and place quantitative constraints on the (56) Co line emission from iron production in thermonuclear supernovae and on models of a matter-antimatter symmetric universe.

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