Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..apr.w2002h&link_type=abstract
American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.
Physics
Scientific paper
Over the past four years, analysis of results obtained by the Cosmic Background Explorer (COBE), have yielded increasingly reliable measures of the extragalactic infrared background radiation. This radiation touches on many topics: The rate at which energy was generated in galaxies at different cosmic epochs; the corresponding number counts of luminous infrared galaxies observed with the Infrared Space Observatory (ISO) and their respective red shifts; the related rate at which non-primordial helium and the heavy chemical elements were produced at these same epochs as seen in Lyman-alpha absorbers and in Galactic stars formed at corresponding times; the supernova rates integrated over all epochs; and the number of neutron stars and black holes in our locale within the Universe today. The distances from which the highest-energy TeV-gamma rays can reach us are also intimately related to the energy density of the infrared background and its spectrum. These varied observations are now beginning to lead to a coherent picture of cosmic energy generation and the formation of heavy elements during the past few billion years. note
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