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Can quasars ionize the intergalactic medium?The intergalactic environmental impact of quasars is studied in the light of recent QSO observations, addressing in particular whether QSOs can ionize the IGM at z greater than 3.0. After deriving the expansion law for cosmological ionization fronts in a Friedmann universe, it is investigated whether the QSO population is sufficient for these ionized regions to overlap by z of roughly 3.5. The effects of cosmological I-fronts on Lyman-alpha clouds in QSO absorption spectra are discussed.
Document ID
19880033188
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Donahue, Megan
(Colorado, University Boulder, United States)
Shull, J. Michael
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 323
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A20415
Funding Number(s)
CONTRACT_GRANT: NAGW-766
CONTRACT_GRANT: NSG-7128
Distribution Limits
Public
Copyright
Other

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