Research output: Contribution to journal › Article › peer-review
Sources of radiation in the early universe: The equation of radiative transfer and optical distances. / Nagirner, D. I.; Kirusheva, S. L.
In: Astronomy Reports, Vol. 49, No. 3, 01.01.2005, p. 167-178.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Sources of radiation in the early universe: The equation of radiative transfer and optical distances
AU - Nagirner, D. I.
AU - Kirusheva, S. L.
PY - 2005/1/1
Y1 - 2005/1/1
N2 - 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 8-104. 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.© 2005 Pleiades Publishing, Inc.
AB - 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 8-104. 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.© 2005 Pleiades Publishing, Inc.
UR - http://www.scopus.com/inward/record.url?scp=17544365385&partnerID=8YFLogxK
U2 - 10.1134/1.1882775
DO - 10.1134/1.1882775
M3 - Article
AN - SCOPUS:17544365385
VL - 49
SP - 167
EP - 178
JO - Astronomy Reports
JF - Astronomy Reports
SN - 1063-7729
IS - 3
ER -
ID: 138351200