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Astron. Astrophys. 336, 1-10 (1998)

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Distortion of the CMB spectrum by primeval hydrogen recombination

Péter Boschán and Peter Biltzinger

Institute for Nuclear Physics, University of Münster, Wilhelm-Klemm-Strasse 9, D-48149 Münster, Germany

Received 26 August 1997 / Accepted 27 April 1998


We solve the recombination equation by taking into account the induced recombinations and a physical cut off in the hydrogen spectrum. The effective recombination coefficient is parametrized as a function of temperature and free electron density and is about a factor of four larger than without the induced recombination. This accelerates the last stage of the recombination processes and diminishes the residual ionization by a factor of about 2.6. The number and energy distribution of photons issuing from the hydrogen recombination are calculated. The distortion of the cosmic microwave background (CMB) spectrum depends strongly on the cosmological parameters [FORMULA], [FORMULA] and [FORMULA] and differs essentially from the Planck-spectrum for wavelengths [FORMULA].

Key words: cosmology: theory – cosmic microwave background

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© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998