Cosmological density fluctuations and radiation anisotropy generated by pregalactic sources of radiation

Details Cosmological density fluctuations and radiation anisotropy generated by pregalactic sources of radiation Cosmological density fluctuations and radiation anisotropy generated by pregalactic sources of radiation

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274....7h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 7-19. Research supported by the Science and Engineeri

Mathematics

Logic

22

Astronomical Models, Cosmology, Galactic Evolution, Galactic Radiation, Space Density, Anisotropy, Background Radiation, Entropy, Fluctuation Theory, Gas Ionization

Scientific paper

A model is presented for the creation of cosmological density fluctuations on scales greater than 1 Mpc which generalizes conventional models, based on primordial fluctuations in entropy per baryon, to entropy fluctuations introduced at later epochs, during an 'intermediate' period of pregalactic activity. These fluctuations would naturally be produced by sources of radiation, such as quasars or ordinary massive stars in protogalaxies, at epochs approximately equal to 10 to the 5th - 10 to the 7th yr corresponding to redshifts z approximately equal to 100-1000. The model universe contains photoionized gas coupled to radiation by Thomson scattering, and a population of sources with randomly variable luminosity per mass. The transport of radiation and the evolution of perturbations in gas and source density are described by a system of coupled linear equations. Analytical and numerical estimates are given of the amplitude and spectrum of the density fluctuations produced, and of the expected amplitude and angular spectrum of anisotropies in the microwave background. These predictions are compared with current observational results.

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