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The Dependence of the Galaxy Luminosity Function on Large-Scale Environment | | H.J. Mo
; Xiaohu Yang
; Frank C. van den Bosch
; Y.P Jing
; | | Date: |
6 Oct 2003 | | Journal: | Mon.Not.Roy.Astron.Soc. 349 (2004) 205 | | Subject: | astro-ph | | Affiliation: | UMass), Xiaohu Yang (UMass), Frank C. van den Bosch (IoA, Zurich), Y.P Jing (Shanghai Obs. | | Abstract: | A basic assumption in current halo occupation model is that the properties of a galaxy depend only on the mass of its dark matter halo. An important consequence of this is that the segregation of the galaxy population by large-scale environment is entirely due to the environmental dependence of the halo population. In this paper we use such a model to predict how the galaxy luminosity function depends on large-scale environment. The latter is represented by the density contrast (delta) averaged over a spherical volume of radius R=8Mpc/h. The model predicts that the Schechter function is a good approximation to the luminosity functions of galaxies brighter than ~10^9 h^{-2}L_sun (b_j-band) in virtually all environments. The characteristic luminosity, L^{star}, increases moderately with delta. The faint-end slope, alpha, on the other hand, is quite independent of $delta$. However, when splitting the galaxy population into early and late types, it is found that for late-types alpha is virtually constant, whereas for early-types alpha increases from ~-0.3 in underdense regions (delta~-0.5) to ~-0.8 in highly overdense regions with delta ~ 10. The luminosity function at L_{b_j}<10^9 h^{-2} L_sun is significantly steeper than the extrapolation of the Schechter function that fits the brighter galaxies. This steepening is more significant for early-types and in low-density environments. The model also predicts that the luminosity density and mass density are closely correlated. The relation between the two is monotonic but highly non-linear. This suggests that one can use the luminosity density, averaged over a large volume, to rank the mass density. This, in turn, allows the environmental effects predicted here to be tested by observations. | | Source: | arXiv, astro-ph/0310147 | | Services: | Forum | Review | PDF | Favorites | |
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