Influence of short-duration matter temperature perturbations on the cosmological hydrogen recombination spectrum

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Influence of short-duration matter temperature perturbations on the cosmological hydrogen recombination spectrum. / Dubrovich, V. K.; Grachev, S. I.; Romanyuk, V. G.

In: Astronomy Letters, Vol. 35, No. 11, 11.2009, p. 723-729.

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

BibTeX

@article{1f4e1a45c1f9446b89bfbff202436c72,

title = "Influence of short-duration matter temperature perturbations on the cosmological hydrogen recombination spectrum",

abstract = "A perturbation in the ratio of the matter temperature to the radiation temperature in the form of a Gaussian with amplitude A and width σ (in units of the redshift z) centered at some redshift zc is considered, with some {"}standard{"} temperature ratio obtained from a simultaneous solution of the cosmological recombination kinetics and energy equations being taken as the initial (unperturbed) one. Comparatively small (A = ± 0.01), fast (σ = 17) perturbations are shown to give rise to distinct narrow absorption (for A > 0) or emission (for A < 0) quasi-lines in each of the subordinate continua. The positions of these quasi-lines correlate with the position of the perturbation center, while their intensities are very sensitive to the perturbation amplitude. At the same time, the manifestation of the perturbation is much less clear in hydrogen lines (subordinate ones and the Ly-α line) and two-photon emission. As a result, the full perturbed spectrum is characterized by the presence of the narrow quasi-lines mentioned above and by a general decrease (for A > 0) or increase (for A < 0) in intensity with increasing wavelength.",

keywords = "Cosmic microwave background radiation (CMBR), Cosmological recombination, Cosmology, Early Universe",

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

note = "Funding Information: This work was supported by the Russian Foundation for Basic Research (project no. 08-02-00493), the Program of the Russian President for Support of Leading Scientific Schools (NSh-8542.2006.2), and the “Development of the Potential of Higher School” Program (no. 2.1.1/594). Copyright: Copyright 2009 Elsevier B.V., All rights reserved.",

year = "2009",

month = nov,

doi = "10.1134/S1063773709110012",

language = "English",

volume = "35",

pages = "723--729",

journal = "Astronomy Letters",

issn = "1063-7737",

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

number = "11",

}

RIS

TY - JOUR

T1 - Influence of short-duration matter temperature perturbations on the cosmological hydrogen recombination spectrum

AU - Dubrovich, V. K.

AU - Grachev, S. I.

AU - Romanyuk, V. G.

N1 - Funding Information: This work was supported by the Russian Foundation for Basic Research (project no. 08-02-00493), the Program of the Russian President for Support of Leading Scientific Schools (NSh-8542.2006.2), and the “Development of the Potential of Higher School” Program (no. 2.1.1/594). Copyright: Copyright 2009 Elsevier B.V., All rights reserved.

PY - 2009/11

Y1 - 2009/11

N2 - A perturbation in the ratio of the matter temperature to the radiation temperature in the form of a Gaussian with amplitude A and width σ (in units of the redshift z) centered at some redshift zc is considered, with some "standard" temperature ratio obtained from a simultaneous solution of the cosmological recombination kinetics and energy equations being taken as the initial (unperturbed) one. Comparatively small (A = ± 0.01), fast (σ = 17) perturbations are shown to give rise to distinct narrow absorption (for A > 0) or emission (for A < 0) quasi-lines in each of the subordinate continua. The positions of these quasi-lines correlate with the position of the perturbation center, while their intensities are very sensitive to the perturbation amplitude. At the same time, the manifestation of the perturbation is much less clear in hydrogen lines (subordinate ones and the Ly-α line) and two-photon emission. As a result, the full perturbed spectrum is characterized by the presence of the narrow quasi-lines mentioned above and by a general decrease (for A > 0) or increase (for A < 0) in intensity with increasing wavelength.

AB - A perturbation in the ratio of the matter temperature to the radiation temperature in the form of a Gaussian with amplitude A and width σ (in units of the redshift z) centered at some redshift zc is considered, with some "standard" temperature ratio obtained from a simultaneous solution of the cosmological recombination kinetics and energy equations being taken as the initial (unperturbed) one. Comparatively small (A = ± 0.01), fast (σ = 17) perturbations are shown to give rise to distinct narrow absorption (for A > 0) or emission (for A < 0) quasi-lines in each of the subordinate continua. The positions of these quasi-lines correlate with the position of the perturbation center, while their intensities are very sensitive to the perturbation amplitude. At the same time, the manifestation of the perturbation is much less clear in hydrogen lines (subordinate ones and the Ly-α line) and two-photon emission. As a result, the full perturbed spectrum is characterized by the presence of the narrow quasi-lines mentioned above and by a general decrease (for A > 0) or increase (for A < 0) in intensity with increasing wavelength.

KW - Cosmic microwave background radiation (CMBR)

KW - Cosmological recombination

KW - Cosmology

KW - Early Universe

UR - http://www.scopus.com/inward/record.url?scp=70449370536&partnerID=8YFLogxK

U2 - 10.1134/S1063773709110012

DO - 10.1134/S1063773709110012

M3 - Article

AN - SCOPUS:70449370536

VL - 35

SP - 723

EP - 729

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 11

ER -

ID: 74195211