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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4434
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dc.contributor.authorNath, Biman B.-
dc.contributor.authorZdziarski, Andrzej-
dc.date.accessioned2012-05-07T08:33:26Z-
dc.date.available2012-05-07T08:33:26Z-
dc.date.issued1990-10-
dc.identifier.citationAstrophysical Journal,1990, Vol. 362,p25en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/4434-
dc.descriptionRestricted Access.en
dc.description.abstractIf the universe were radiation-dominated at redshifts greater than about 100-1000, e.g., due to the presence of a small fraction of light particles in the dark matter, it would be optically thin in soft gamma-rays up to redshifts of 10,000. This is larger by an order of magnitude than for the matter-dominated universe. X-rays and gamma-rays produced by cosmological high-energy processes are thus potentially observable up to z of about 10,000. Analytical formulas are derived for the optical depths of radiation-dominated universe due to photoionization, Compton scattering, photon-matter pair production, photon-photon scattering, and photon-photon pair production, in interactions with the cosmic thermal background and baryonic matter.en
dc.language.isoenen
dc.publisherAmerican Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/abs/1990ApJ...362...25Nen
dc.relation.urihttp://dx.doi.org/10.1086/169239en
dc.rights1990 The American Astronomical Societyen
dc.subjectcosmic raysen
dc.subjectdark matteren
dc.subjectoptical thicknessen
dc.subjectradiation distributionen
dc.subjectred shiften
dc.subjectcompton effecten
dc.subjectpair productionen
dc.subjectrelativistic particlesen
dc.titleOptical depth of the universe at radiation-dominated epochsen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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