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Record Details

Record 100 of 9714
The recombination epoch revisited
External Online Source: doi:10.1086/167221
Author and Affiliation:
Krolik, Julian H.(Johns Hopkins University, Baltimore, MD, United States)
Abstract: Previous studies of cosmological recombination have shown that this process produces as a by-product a highly superthermal population of Ly-alpha photons which retard completion of recombination. Cosmological redshifting was thought to determine the frequency distribution of the photons, while two-photon decay of hydrogen's 2s state was thought to control their numbers. It is shown here that frequency diffusion due to photon scattering dominate the cosmological redshift in the frequency range near line center which fixes the ratio of ground state to excited state population, while incoherent scattering into the far-red damping wing effectively destroys Ly-alpha photons as a rate which is competitive with two-photon decay. The former effect tends to hold back recombination, while the latter tends to accelerate it; the net results depends on cosmological parameters, particularly the combination Omega(b) h/sq rt (2q0), where Omega(b) is the fraction of the critical density provided by baryons.
Publication Date: Mar 15, 1989
Document ID:
19890043781
(Acquired Nov 28, 1995)
Accession Number: 89A31152
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 338; 594-604
Publisher Information: United States
Contract/Grant/Task Num: NAGW-1017
Financial Sponsor: NASA; United States
Organization Source: Johns Hopkins Univ.; Baltimore, MD, United States
Description: 11p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COSMOLOGY; LYMAN ALPHA RADIATION; RELIC RADIATION; FREQUENCY DISTRIBUTION; INCOHERENT SCATTERING; PHOTOIONIZATION; PHOTONS; PROBABILITY DISTRIBUTION FUNCTIONS; RECOMBINATION COEFFICIENT; RED SHIFT
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 594-604.
Availability Source: Other Sources
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