Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-11
Astron.Rep. 49 (2005) 167-178; Pisma Astron.Zh. 82 (2005) 195-206
Astronomy and Astrophysics
Astrophysics
14 pages, 2 figures
Scientific paper
10.1134/1.1882775
We have derived the radiative-transfer equation for a point source with a specified intensity and spectrum, originating in the early Universe between the epochs of annihilation and recombination, at redshifts $z_\s =10^8\div 10^4$. The direct radiation of the source is separated from the diffuse radiation it produces. Optical distances from the source for Thomson scattering and bremsstrahlung absorption at the maximum of the thermal background radiation are calculated as a function of the redshift z.The distances grow sharply with decreasing z, approaching asymptotic values, the absorption distance increasing more slowly and reaching their limiting values at lower z. For the adopted z values, the optical parameters of the Universe can be described in a flat model with dusty material and radiation, and radiative transfer can be treated in a grey approximation.
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