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Current QSO statistics - Implications for the intergalactic mediumThe results of numerous QSO surveys have been compiled and analyzed to form a single spatially averaged QSO ionizing function that is independent of evolution mode (number density or luminosity). An intergalactic medium (IGM) that satisfies the observational constraints may now have a density with respect to closure of approximately 0.1, which is substantially less than hitherto modeled. The aggregate of QSO data also indicate that if evolution is due to number density, then, when split into luminosity classes, an exponential in look-back time fits the data better than a power law, and the evolution rates increase roughly with absolute luminosity if analyzed by the exponential.
Document ID
19810053448
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sherman, R. D.
(California Institute of Technology; California Institute of Technology, Jet Propulsion Laboratory, Theoretical Physics and Cosmology Group, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
81A37852
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NSF AST-77-22615
Distribution Limits
Public
Copyright
Other

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