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The diffuse gamma-ray background, light element abundances, and signatures of early massive star formationAttention is drawn to a potentially observable flux of diffuse extragalactic gamma rays produced by inelastic cosmic-ray interactions that is inevitably a by-product of spallation-synthesized Be. The epoch of cosmic ray-induced Population II light element nucleosynthesis is constrained to be at redshift greater than 0.5. A spectral feature in the diffuse extragalactic gamma-ray background with amplitude 0.1 above 10 MeV is predicted if the Be is synthesized at z less than 10. The possibility is discussed that the cosmic-ray flux responsible for Population II Be and B synthesis may be associated with a precursor hypothesized Population III.
Document ID
19920061213
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Silk, Joseph
(California, University Berkeley, United States)
Schramm, David N.
(California, University, Berkeley; Chicago, University; NASA/Fermilab Astrophysics Center Batavia, IL, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 393
Issue: 1, Ju
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A43837
Distribution Limits
Public
Copyright
Other

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