Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The infrared side of galaxy formation. I. The local universe in the
  semi-analytical framework   We present a new evolutionary model for the far-UV to sub-mm properties of
the galaxy population. This combines a semi-analytic galaxy formation model
based on hierarchical clustering (GALFORM) with a spectro-photometric code
which includes dust reprocessing (GRASIL). The former provides the star
formation and metal enrichment histories, together with the gas mass and
various geometrical parameters, for a representative sample of galaxies formed
in different density environments. These quantities allow us to model the SEDs
of galaxies, taking into account stellar emission and also dust extinction and
re-emission. Two phases are considered for the dust: molecular cloud complexes,
where stars are assumed to be born, and the diffuse interstellar medium. The
model includes both galaxies forming stars quiescently in disks, and starbursts
triggered by galaxy mergers. We test our models against the observed
spectro-photometric properties of galaxies in the local Universe. The models
reproduce fairly well the SEDs of normal spirals and starbursts, and their
internal extinction properties. The starbursts follow the observed relationship
between the FIR to UV luminosity ratio and the slope of the UV continuum. They
also reproduce the observed starburst attenuation law (Calzetti et al 99). This
result is remarkable, because we use a dust mixture which reproduces the Milky
Way extinction law. It suggests that the observed attenuation law is related to
the geometry of the stars and dust. We compute galaxy luminosity functions over
our wide range of wavelengths, which turn out to be in good agreement with
observational data. The UV continuum turns out to be a poor star formation
indicator for our models, whilst the infrared luminosity is much more reliable.

25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph