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Weak gravitational lensing due to large-scale structure of the universeThe effect of the large-scale structure of the universe on the propagation of light rays is studied. The development of the large-scale density fluctuations in the omega = 1 universe is calculated within the cold dark matter scenario using a smooth particle approximation. The propagation of about 10 to the 6th random light rays between the redshift z = 5 and the observer was followed. It is found that the effect of shear is negligible, and the amplification of single images is dominated by the matter in the beam. The spread of amplifications is very small. Therefore, the filled-beam approximation is very good for studies of strong lensing by galaxies or clusters of galaxies. In the simulation, the column density was averaged over a comoving area of approximately (1/h Mpc)-squared. No case of a strong gravitational lensing was found, i.e., no 'over-focused' image that would suggest that a few images might be present. Therefore, the large-scale structure of the universe as it is presently known does not produce multiple images with gravitational lensing on a scale larger than clusters of galaxies.
Document ID
19910033159
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jaroszynski, Michal
(Observatorium Astronomiczne, Warsaw, Poland; Princeton University Observatory, NJ, United States)
Park, Changbom
(Obserwatorium Astronomiczne Warsaw, Poland)
Paczynski, Bohdan
(Obserwatorium Astronomiczne Warsaw, Poland)
Gott, J. Richard, III
(Princeton University Observatory, NJ, United States)
Date Acquired
August 15, 2013
Publication Date
December 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A17782
Funding Number(s)
CONTRACT_GRANT: NSF AST-87-18432
CONTRACT_GRANT: NSF AST-87-21484
CONTRACT_GRANT: NAGW-765
Distribution Limits
Public
Copyright
Other

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