Abstract
view Abstract Citations (126) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Statistics of the Cosmic Mach Number from Numerical Simulations of a Cold Dark Matter Universe Suto, Yasushi ; Cen, Renyue ; Ostriker, Jeremiah P. Abstract Results 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. Publication: The Astrophysical Journal Pub Date: August 1992 DOI: 10.1086/171626 Bibcode: 1992ApJ...395....1S Keywords: Dark Matter; Digital Simulation; Galactic Evolution; Mach Number; Statistics; Computational Astrophysics; Velocity Distribution; Astrophysics; COSMOLOGY: THEORY; COSMOLOGY: DARK MATTER; HYDRODYNAMICS; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE full text sources ADS |
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