The universe between Z = 10 and and Z = 1000 - Spectral constraints on reheating

Details The universe between Z = 10 and and Z = 1000 - Spectral constraints on reheating The universe between Z = 10 and and Z = 1000 - Spectral constraints on reheating

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300....1s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 1-19.

Astronomy and Astrophysics

Astrophysics

39

Baryons, Cosmology, Evolution (Development), Heating, Universe, Background Radiation, Constraints, Cosmic Rays, Electron Energy, Stellar Mass

Scientific paper

The possible thermal histories of the universe during the epoch z = 10-1000 are studied. Expressions for the fractional ionization and electron temperature are given in the case of homogeneous heating as a function of the parameters of arbitrary ionizing sources. It is shown that present and future limits on spectral distortions to the microwave background radiation do not provide very restrictive constraints on possible thermal histories of the universe. If H(0) = 50 km/s Mpc, the universe could have been completely ionized throughout its history with no observable spectral effects even if Omega = 1 and the universe is entirely made of baryons. Heating by cosmic rays and very massive stars is briefly discussed.

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