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Setting limits on q0 from gravitational lensingGravitational lensing by galaxies in a wide variety of cosmological models is considered. For closed models, the lensing depends on the parameter beta(crit). If beta(crit) is greater than zero, a normal lensing case can be obtained with two bright images separated by an angle twice beta(crit) and a third, arbitrarily dim image between them coincident with the position of the lensing galaxy nucleus. As the QSO approaches the antipodal redshift, which can occur in models with large values of the cosmological constant, the cross sections for lensing blow up. An overfocused case where beta(crit) is less than zero can be obtained for a QSO beyond the antipodal redshift. In this case, when a lensing event occurs, only one arbitrarily dim image coincident with the position of the lensing galaxy nucleus is seen. If galaxy rotation curves are always flat or slowly rising, the overfocused case always produces one image.
Document ID
19890039630
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gott, J. Richard, III
(Princeton Univ. NJ, United States)
Park, Myeong-Gu
(Princeton University NJ, United States)
Lee, Hyung Mok
(Toronto, University Canada)
Date Acquired
August 14, 2013
Publication Date
March 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 338
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A27001
Funding Number(s)
CONTRACT_GRANT: NAGW-765
Distribution Limits
Public
Copyright
Other

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