Cosmological velocity bias

Details Cosmological velocity bias Cosmological velocity bias

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352l..29c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 352, April 1, 1990, p. L29-L32. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

77

Cosmology, Gravitational Collapse, Radial Velocity, Cooling Flows (Astrophysics), Star Formation, Velocity Distribution

Scientific paper

Gravitationally bound objects, such as galaxies, that collapse from a cosmological background can exhibit both a correlation bias and, as shown here, a significant bias in their peculiar velocity dispersion with respect to the density field. The detailed simulations of a cold dark matter cosmology reported here indicate that together these two kinds of bias can reconcile a galaxy correlation length of 5/h Mpc and a peculiar velocity dispersion of approximately 300 km/s with an Omega = 1 cosmology, for a range of correlation biases. For the adopted star formation algorithm, the galaxies in the simulation are found to have properties similar to those of the dense cores of dark halos.

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