Dynamics of the Primordial Hydrogen and Helium (HeI) Recombination in the Universe

Details Dynamics of the Primordial Hydrogen and Helium (HeI) Recombination in the Universe Dynamics of the Primordial Hydrogen and Helium (HeI) Recombination in the Universe

2005-01-31

arxiv.org/abs/astro-ph/0501672v1

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures, accepted for publication in Astronomy Letters

Scientific paper

The dependences on z of fractional number densities of H+ and He+ ions are calculated with a proper allowance for two-photon decays of upper levels of hydrogen and parahelium and radiative transfer in intercombination line 2 3P_1 --> 1 1S_0 of helium. It is shown that for hydrogen this gives corrections for a degree of ionization in no more than a few percents but for helium this leads to a significant acceleration of recombination compared to the recent papers by Seager et al. (1999; 2000) where these effects were ignored.

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