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Statistics of the cosmic Mach number from numerical simulations of a cold dark matter universeResults are presented of an analysis of the cosmic Mach number, M, the ratio of the streaming velocity, v, to the random velocity dispersion, sigma, of galaxies in a given patch of the universe, which was performed on the basis of hydrodynamical simulations of the cold dark matter scenario. Galaxy formation is modeled by application of detailed physical processes rather than by the ad hoc assumption of 'bias' between dark matter and galaxy fluctuations. The correlation between M and sigma is found to be very weak for both components. No evidence is found for a physical 'velocity bias' in the quantities which appear in the definition of M. Standard cold-dark-matter-dominated universes are in conflict, at a statistically significant level, with the available observation, in that they predict a Mach number considerably lower than is observed.
Document ID
19930028504
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Suto, Yasushi
(Kyoto Univ. Uji, Japan)
Cen, Renyue
(NASA Headquarters Washington, DC United States)
Ostriker, Jeremiah P.
(Princeton Univ. Observatory, NJ, United States)
Date Acquired
August 15, 2013
Publication Date
August 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 395
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A12501
Funding Number(s)
CONTRACT_GRANT: NAGW-765
Distribution Limits
Public
Copyright
Other

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