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Cosmic Flows: Review of Recent Developments

By Saleem Zaroubi

Abstract

Abstract: I review the recent developments in the analysis of cosmic flow data, in particular, latest results of bulk flow measurements, comparison between redshift and peculiar velocity catalogs with emphasis on the measured value of the β ( = Ω0.6 m /b) parameter, and matter power spectrum estimates from galaxy peculiar velocity catalogs. Based on these developments, one can argue that most of the previous discrepancies in the interpretation of cosmic flow data, maybewith the exception of bulk flow measurements on scales> ∼ 10h −1 Mpc, have either been resolved or fairly understood. Within the gravitational instability (GI) framework for the growth of cosmic structures, the peculiar velocity field of galaxies and clusters provides a direct and reliable probe of the matter distribution, under the natural assumption that these objects are unbiased tracers of the large-scale, gravitationally induced

Year: 2002
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