The cosmic rms bulk velocity estimated from QSOs' Lyα forests

Details The cosmic rms bulk velocity estimated from QSOs' Lyα forests The cosmic rms bulk velocity estimated from QSOs' Lyα forests

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..4cf.ed002z&link_type=abstract

American Physical Society, Four Corners Annual Meeting November 2 - 3, 2001 New Mexico State University; Las Cruces, New Mexico

Physics

Scientific paper

We propose a method for estimating the large-scale rms bulk velocity of the cosmic mass field from the transmitted fluxes of Lyα forests. It is based on two linear relationships on large scales: 1) the relation between the fluctuations of the transmission and the underlying density field, and 2) the relation between the density fluctuations and the peculiar velocity field. We show that, with a multiscale decomposition, the two relations can be employed effectively to predict the rms bulk velocity. Since QSO's Lyα forest is due to the absorptions of diffusely distributed and photoionized IGM, which traces closely the distribution of dark matter on large scales, this method provides an (independent) estimate of the rms bulk velocity at high redshifts, on large scales, and free from galaxy bias.

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