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Infall patterns around rich clusters of galaxiesThe pattern of infall velocities induced by a rich cluster of galaxies is considered, using an infall model based on the Friedmann solution to determine the exact implicit dependence of the peculiar velocity on the density enhancment and the mean cosmological mass density, Omega(0). An analytic model for the distribution of galaxies around a cluster core in redshift space is developed. The high-density caustics in redshift space are shown to appear as envelopes around rich clusters. Assuming that the galaxies trace the matter distribution, low Omega(0) models can explain observational data obtained for four clusters. The present results support the prediction that light traces mass in the infall region.
Document ID
19890064355
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Regos, Eniko
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Eotvos Lorand Tudomanyegyetem Budapest, Hungary)
Geller, Margaret J.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Astronomical Journal
Volume: 98
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
89A51726
Funding Number(s)
CONTRACT_GRANT: NAGW-201
Distribution Limits
Public
Copyright
Other

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