Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..370s&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 15, 1982, p. 370-373.
Astronomy and Astrophysics
Astrophysics
17
Cosmic Plasma, Cosmology, High Temperature Plasmas, Intergalactic Media, Abundance, Collisional Plasmas, Constraints, Helium Plasma, Hydrogen Plasma, Optical Thickness
Scientific paper
A hot uniform collisionally heated intergalactic medium (IGM) at closure density is reconsidered. Optical depth measurements, plasma cooling and ionic abundances during the recombination epoch are discussed. The data are used to calculate X-radiation at critical energies. The results indicate a present temperature from 160,000 to 4,200,000 K if the reheating of the IGM ceased at the latest possible time. As cessation of heating moves to earlier times, the range of present plasma temperature narrows until at the earliest possible cessation time only about 160,000 K is acceptable. Relevant formulae are provided to modify these numbers as new data become available. This IGM avoids any hard X-ray production and thus assumes that discrete sources alone constitute the entire cosmic X-ray background.
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