Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-23
Astrophys.J. 581 (2002) 876-885
Astronomy and Astrophysics
Astrophysics
29 pages, 12 figures, 1 tables. Accepted for publication in ApJ
Scientific paper
10.1086/344369
We investigate the feasibility of determining the pairwise velocity dispersion (PVD) for Lyman Break Galaxies (LBGs), and of using this quantity as a discriminator among theoretical models. We find that when the Two Point Correlation Function over the range of observable separations is fixed, different schemes of galaxy formation will lead to significant changes in PVD, while influence of different cosmogonies is invisible. Our test with mock samples shows furthermore that one can discriminate among such models already with currently available observational samples (if the measurement error of the redshift is negligible) which have a typical error of $80\kms$. The error will be reduced by a factor of 2 if the samples are increased four times. We also show that an erroneous assumption about the geometry of the universe and different infall models only slightly change the results. Therefore the PVD will become another promising statistic to test galaxy formation models with redshift samples of LBGs.
Boerner Gerhard
Jing Yi-Peng
Zhao Dong-Hai
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