Contribution of Supernova Gamma-Rays to the Gamma-Ray Background Emission

Details Contribution of Supernova Gamma-Rays to the Gamma-Ray Background Emission Contribution of Supernova Gamma-Rays to the Gamma-Ray Background Emission

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..669i&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 4, pp. 669-673

Astronomy and Astrophysics

Astronomy

2

Cosmology: Diffuse Radiation, Gamma Rays: Theory, Supernovae: General

Scientific paper

Diffuse γ-ray background emission has been observed by a number of satellites and balloons. The spectrum spreads over a wide range of photon energies, and the emission is almost isotropic. Although the origin of diffuse γ-ray background emission is still unclear, some candidates are suggested, such as Seyfert galaxies, blazars, and type-Ia supernovae. The type-Ia supernovae synthesize a large amount of 56Ni, which emit γ-ray photons while decaying into 56Co and then to 56Fe, and thus emit strong γ-rays of energy around 1MeV. We estimate the intensity of the diffuse γ-ray background emission from supernovae, and compare the result with the recent observation of COMPTEL. The resultant spectrum is too small to explain the observation, because it is only 10% of the observed flux, implying contributions from other sources.

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