Relict-radiation fluctuations produced by secondary ionization of matter in the universe

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Cosmic Gases, Cosmology, Gas Ionization, Intergalactic Media, Perturbation Theory, Galactic Clusters, Microwave Emission, Plasma Heating, Red Shift

Scientific paper

The hypothesis is considered that secondary heating and ionization of intergalactic gas at redshifts of about 10 to 30 might lead to a large optical thickness of the universe to Thomson scattering and might smear out primeval fluctuations produced during the period of hydrogen recombination at a redshift of approximately 1500. It is shown that various motions related to large-scale density perturbations could result in secondary fluctuations of the relict radiation at redshifts of about 10 to 15. Relict-radiation fluctuations associated with rich clusters of galaxies and with young galaxies are also evaluated.

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