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Gravitational lensing in a cold dark matter universeGravitational lensing due to mass condensations in a biased cold dark matter (CDM) universe is investigated using the Press-Schechter (1974) theory with density fluctuation amplitudes taken from previous N-body work. Under the critical assumption that CDM haloes have small core radii, a distribution of image angular separations for high-z lensed quasars with a peak at about 1 arcsec and a half-width of a factor of about 10. Allowing for selection effects at small angular separations, this is in good agreement with the observed separations. The estimated frequency of lensing is somewhat lower than that observed, but the discrepancy can be removed by invoking amplification bias and by making a small upward adjustment to the density fluctuation amplitudes assumed in the CDM model.
Document ID
19880044148
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Narayan, Ramesh
(NASA Headquarters Washington, DC United States)
White, Simon D. M.
(Steward Observatory Tucson, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 231
ISSN: 0035-8711
Subject Category
Astrophysics
Accession Number
88A31375
Funding Number(s)
CONTRACT_GRANT: NAGW-763
CONTRACT_GRANT: NSF AST-86-11121
Distribution Limits
Public
Copyright
Other

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