A model of the cosmic X-and γ-ray background

M. Matsuoka, N. Terasawa, M. Hattori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


The origin of wide band cosmic X-and γ-ray background has not been well understood, but recently it has been considered that the cosmic X-ray background in the energy range below several 100 keV is well reproduced by the superposition of AGN X-ray spectra with a hard bump (Morisawa et al. 1990; Fabian et al. 1990; Rogers & Field 1991; Terasawa 1991). It should be noted that this interpretation is based on the recent Ginga observations of the X-ray spectrum of AGN (Morisawa et al. 1990; Matsuoka et al. 1990). On the other hand, the cosmic γ-ray background above 0.5 MeV which shows a broad bump around a few MeV seems to require an additional component to the superposition spectrum of AGN X-ray radiation. In order to explain this cosmic γ-ray background we investigate the model in which π 0 γ-rays are produced by p-p and/or α-p interaction of cosmological cosmic rays. The cosmological cosmic rays could be provided from explosions of Population III objects. It is known that this basic theory has been proposed by Stecker (1971).

Original languageEnglish
Title of host publicationCompton Gamma-Ray Observatory
EditorsNeil Gehrels, Michael W. Friedlander, Daryl J. Macomb
PublisherAmerican Institute of Physics Inc.
Number of pages5
ISBN (Electronic)1563961040
Publication statusPublished - 1993 Jan 1
Externally publishedYes
EventCompton Symposium - St. Louis, United States
Duration: 1992 Oct 151992 Oct 17

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceCompton Symposium
Country/TerritoryUnited States
CitySt. Louis

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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