Recombination dynamics of primordial hydrogen and helium (HeI) in the universe

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Recombination dynamics of primordial hydrogen and helium (HeI) in the universe. / Dubrovich, V. K.; Grachev, S. I.

In: Astronomy Letters, Vol. 31, No. 6, 2005, p. 359-364.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{a943d88bdaef44e49d2d50e49270602e,

title = "Recombination dynamics of primordial hydrogen and helium (HeI) in the universe",

abstract = "We calculated the ionization fraction for hydrogen and helium (HeI) as a function of the redshift z by including the two-photon decays of high hydrogen and parahelium levels and the radiative transfer in the helium 2 3P1 ↔ 11S0 intercombination line. We show that this yields corrections of no more than a few percent to the ionization fraction for hydrogen and speeds up significantly the recombination for helium compared to the recent works by Seager et al. (1999, 2000), in which these effects were disregarded.",

keywords = "Cosmic microwave background radiation, Cosmology, Early Universe, Primordial helium, Radio astronomy, Recombination",

author = "Dubrovich, {V. K.} and Grachev, {S. I.}",

note = "Funding Information: This work was supported by the Russian Foundation for Basic Research (project no. 02-02-16535, a Presidential Grant for the Support of Leading Scientific Schools (no. NSh-1088.2003.2), the federal Astronomy program, and State Contract no. 40.022.1.1.1106. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2005",

doi = "10.1134/1.1940107",

language = "English",

volume = "31",

pages = "359--364",

journal = "Astronomy Letters",

issn = "1063-7737",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "6",

}

RIS

TY - JOUR

T1 - Recombination dynamics of primordial hydrogen and helium (HeI) in the universe

AU - Dubrovich, V. K.

AU - Grachev, S. I.

N1 - Funding Information: This work was supported by the Russian Foundation for Basic Research (project no. 02-02-16535, a Presidential Grant for the Support of Leading Scientific Schools (no. NSh-1088.2003.2), the federal Astronomy program, and State Contract no. 40.022.1.1.1106. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2005

Y1 - 2005

N2 - We calculated the ionization fraction for hydrogen and helium (HeI) as a function of the redshift z by including the two-photon decays of high hydrogen and parahelium levels and the radiative transfer in the helium 2 3P1 ↔ 11S0 intercombination line. We show that this yields corrections of no more than a few percent to the ionization fraction for hydrogen and speeds up significantly the recombination for helium compared to the recent works by Seager et al. (1999, 2000), in which these effects were disregarded.

AB - We calculated the ionization fraction for hydrogen and helium (HeI) as a function of the redshift z by including the two-photon decays of high hydrogen and parahelium levels and the radiative transfer in the helium 2 3P1 ↔ 11S0 intercombination line. We show that this yields corrections of no more than a few percent to the ionization fraction for hydrogen and speeds up significantly the recombination for helium compared to the recent works by Seager et al. (1999, 2000), in which these effects were disregarded.

KW - Cosmic microwave background radiation

KW - Cosmology

KW - Early Universe

KW - Primordial helium

KW - Radio astronomy

KW - Recombination

UR - http://www.scopus.com/inward/record.url?scp=20844449854&partnerID=8YFLogxK

U2 - 10.1134/1.1940107

DO - 10.1134/1.1940107

M3 - Article

VL - 31

SP - 359

EP - 364

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 6

ER -

ID: 5459970