The Lyman Break Galaxies: their Progenitors and Descendants

Details The Lyman Break Galaxies: their Progenitors and Descendants The Lyman Break Galaxies: their Progenitors and Descendants

2001-09-06

arxiv.org/abs/astro-ph/0109104v2

Astronomy and Astrophysics

Astrophysics

29 pages, including 11 figures, ApJ in press. One reference added

Scientific paper

10.1086/324263

We study the evolution of Lyman Break Galaxies (LBGs) from z=5 to z=0 by tracing the merger trees of galaxies in a large-scale hydrodynamic simulation based on a Lambda cold dark matter model. In particular, we emphasize on the range of properties of the sample selected by the rest-frame V band luminosity, in accordance with recent near-IR observations. The predicted rest-frame V band luminosity function agrees well with the observed one when dust extinction is taken into account. The stellar content and the star formation histories of LBGs are also studied. We find that the LBGs intrinsically brighter than Mv=-21.0 at z=3 have stellar masses of at least 10^9\Msun, with a median of 10^{10}h^{-1}\Msun. The brightest LBGs (Mv<-23) at z=3 merge into clusters/groups of galaxies at z=0, as suggested from clustering studies of LBGs. Roughly one half of the galaxies with -23

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