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Article overview
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Galaxy evolution in the infra-red: comparison of a hierarchical galaxy
formation model with SPITZER data | | C.G. Lacey
; C.M. Baugh
; C.S. Frenk
; L. Silva
; G.L. Granato
; A. Bressan
; | | Date: |
12 Apr 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | We present predictions for the evolution of the galaxy luminosity function,
number counts and redshift distributions in the IR based on the Lambda-CDM
cosmological model. We use the combined GALFORM semi-analytical galaxy
formation model and GRASIL spectrophotometric code to compute galaxy SEDs
including the reprocessing of radiation by dust. The model assumes two
different IMFs: a normal solar neighbourhood IMF for quiescent star formation
in disks, and a very top-heavy IMF in starbursts triggered by galaxy mergers.
We have shown previously that the top-heavy IMF seems to be necessary to
explain the number counts of faint sub-mm galaxies. We compare the model with
observational data from the SPITZER Space Telescope, with the model parameters
fixed at values chosen before SPITZER data became available. We find that the
model matches the observed evolution in the IR remarkably well over the whole
range of wavelengths probed by SPITZER. In particular, the SPITZER data show
that there is strong evolution in the mid-IR galaxy luminosity function over
the redshift range z ~ 0-2, and this is reproduced by our model without
requiring any adjustment of parameters. On the other hand, a model with a
normal IMF in starbursts predicts far too little evolution in the mid-IR
luminosity function, and is therefore excluded. | | Source: | arXiv, arxiv.0704.1562 | | Services: | Forum | Review | PDF | Favorites | |
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