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X-ray emission from starburst galaxiesThe results are reported of an investigation of X-ray emission from a sample of 53 IRAS-selected candidate starburst galaxies. Superposed soft and hard X-ray emission from these galaxies in the Einstein-IPC and HEAO-1 A-2 and A-4 energy bands, which span 0.5 to 160 keV, is detected at the 99.6 percent confidence level, after allowing for confusion noise in the HEAO-1 data. Above 15 keV the confidence level is 97 percent. The combined spectrum is flat, with a (photon) power-law index of 1.0 +/- 0.3. The contribution of the population of sources represented by this sample to the 3-50 keV residual cosmic X-ray background is estimated to be at least about 4 percent assuming no evolution. Moderate evolution, for which there is some observational evidence, increases this fractional contribution to about 26 percent.
Document ID
19910072264
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rephaeli, Yoel
(California Univ. La Jolla, CA, United States)
Gruber, Duane
(California Univ. La Jolla, CA, United States)
Macdonald, Dan
(California, University La Jolla, United States)
Persic, Massimo
(Scuola Internazionale Superiore di Studi Avanzati; Osservatorio Astronomico Trieste, Italy)
Date Acquired
August 14, 2013
Publication Date
October 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 380
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
91A56887
Funding Number(s)
CONTRACT_GRANT: NAG5-1385
Distribution Limits
Public
Copyright
Other

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