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- W270442109 abstract "We present a toy model of the growth of galaxies within dark matter haloes via gas accretion and mergers. We begin with sub-halo merger trees from a very high-resolution dark matter cosmological simulation. Three physical processes cause the evolution of the baryons to differ from that of the dark matter by suppressing gas accretion and star formation: gravitational shock heating coupled to black hole feedback above a critical halo mass of Mshock � 10 12 M� ; the reionisation of the intergalactic medium in haloes with circular velocities below vreion � 40kms −1 ; stellar feedback in haloes below vSN � 120kms −1 . Designed to reproduce the present-day stellar mass function of galaxies, our model matches reasonably well the evolution of the cosmic stellar density. It also predicts a gap between the masses of central and satellite galaxies in agreement with recent SDSS observations: in low-mass haloes the mass function is highly peaked in the narrow range of central galaxy masses, whereas high-mass haloes (massive groups and clusters) contain a much more numerous satellite population. Gas accretion is the dominant growth mechanism at mstars mcrit acquire most of their final mass through mergers (mostly major and dry). ‘Cold mode’ mergers (mergers in haloes with Mhalo < Mshock) are rare. Their contribution to galaxy growth is small at all masses but has a maximum at � 10 10.5 h −1 M� . We thus predict a characteristic mass scale of the same order for ULIRGs and quasar hosts." @default.
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- W270442109 date "2010-02-17" @default.
- W270442109 modified "2023-09-27" @default.
- W270442109 title "A toy model of galaxy formation: the importance of mergers, the role of feedback and environmental effects" @default.
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