The ionisation of the primeval plasma at the time of recombination

Details The ionisation of the primeval plasma at the time of recombination The ionisation of the primeval plasma at the time of recombination

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..144j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 144-150. Research supported by the Universite de Par

Astronomy and Astrophysics

Astrophysics

111

Astronomical Models, Baryons, Cosmic Plasma, Ion Recombination, Ionization, Background Radiation, Electron Orbitals, Galactic Evolution, Hydrogen, Red Shift

Scientific paper

The authors rederive the equations for the ionisation of the cosmic plasma during the recombination period, correcting some of the earlier work and refining some approximations inherent in those treatments, and allow for the possibility that the Universe may contain substantial amounts of non-baryonic matter (the cosmic density parameter ΩT may be greater than the baryonic contribution ΩB). The results are tabulated for various ΩTh2 and ΩBh2 and an assumed present day radiation temperature T0 = 2.7K. Two analytic approximations are given: one, valid for z > 1500, is a modification of the standard Saha formula, and the other, valid for 800 < z < 1500 shows that the ionisation if this range scales as (ΩTh2)1/2/(ΩBh2) for cosmologically interesting values of these parameters. The authors give some very simple analytic approximations to the optical depth and visibility function on the interval 800 < z < 1300.

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