A point source of radiation in the early Universe: Solution in a one-dimensional approximation

Details A point source of radiation in the early Universe: Solution in a one-dimensional approximation A point source of radiation in the early Universe: Solution in a one-dimensional approximation

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54...55n&link_type=abstract

Astronomy Reports, Volume 54, Issue 1, pp.55-68

Astronomy and Astrophysics

Astronomy

Scientific paper

The radiation field of a point source with a specified power in the early Universe acting for a specified time in the radiation-dominated epoch after the annihilation of electron-positron pairs is considered. A three-component model for this period is adopted. The equations of radiative transfer for the source are formulated, taking into account polarization arising during scattering of the radiation by free electrons. Analytical, numerical, and asymptotic solutions of the transfer equation are obtained for a flat model in a one-dimensional approximation, which describe the evolution of the intensity and flux of scattered radiation of the source in periods close to the onset of its action. Intervals of redshift corresponding to these periods are estimated. The behavior of the linear polarization near the source is traced. It is shown that the source radiation can be comparable to the thermal background only if the source energy is very high or we consider regions in its immediate vicinity. More optimistic estimates will require that we take into account the decrease in the degree of ionization of matter in the epoch of recombination.

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