Research output: Contribution to journal › Article › peer-review
A point source of radiation in the early Universe: Solution in a one-dimensional approximation. / Nagirner, D. I.; Kirusheva, S. L.
In: Astronomy Reports, Vol. 54, No. 1, 01.01.2010, p. 55-68.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - A point source of radiation in the early Universe: Solution in a one-dimensional approximation
AU - Nagirner, D. I.
AU - Kirusheva, S. L.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - 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. © Pleiades Publishing, Ltd., 2010.
AB - 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. © Pleiades Publishing, Ltd., 2010.
UR - http://www.scopus.com/inward/record.url?scp=74049140757&partnerID=8YFLogxK
U2 - 10.1134/S1063772910010075
DO - 10.1134/S1063772910010075
M3 - Article
AN - SCOPUS:74049140757
VL - 54
SP - 55
EP - 68
JO - Astronomy Reports
JF - Astronomy Reports
SN - 1063-7729
IS - 1
ER -
ID: 113870554