Properties of host haloes of Lyman-break galaxies and Lyman-alpha Emitters from their number densities and angular clustering

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  • 10 July 2003
Abstract
We examine relation between three different populations of high-redshift galaxies and their hosting dark halos employing the halo model approach. Specifically we consider LBGs (Lyman-break galaxies) at z\sim4 and at z\sim5, and LAEs (Lyman-Alpha emitters) at z\simeq4.86, all from the Subaru Deep Field survey. We adopt a halo occupation function (HOF) prescription to parameterize the properties of their hosting halos and the efficiency of halo-dependent star formation. We find that all the three samples are well described by the halo model with an appropriate HOF. Comparing the model predictions with the observed number densities and the angular correlation functions for those galaxies, we obtain constraints on properties of their hosting halos. A possible picture emerging from the current analysis is that LBGs corresponds to a population of central cluster galaxy at the present epoch, and that the LAEs are less massive galaxies whose star formation is somehow triggered at outer regions of very massive halos. On the other hand, we also find that the observed behavior of the angular two-point correlation for LAEs may not fully match the above picture. This may provide a clue to understand the nature of LAEs via future observations.

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