Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fitting optical source counts with an infrared-defined model: insights
  into galaxy evolution   In order to improve the fit to the optical counts, the multi-wavelength
source count model of Rowan-Robinson (2001) is improved in two ways. First,
density evolution is incorporated to correspond to the mergers in hierarchical
models of galaxy formation. Secondly, the evolution of dust opacity is taken
into account. The luminosity and density evolution parameters and the
characteristic opacity of the local universe are allowed to vary freely and the
best overall fit to the B band is determined. This parameter set is then
translated to other wavebands, showing significant improvement of goodness of
fit in the optical, UV and near-IR bands, whilst retaining the goodness of fit
in the far-IR and submillimetre bands of the original model. A significant
fraction of the improvement of fit is shown to be due to the introduction of
optical depth history. The mean value of Av in the local universe for the
best-fitting model is 0.4. The goodness of fit to available star formation
history data is not significantly altered and the form of the evolution of the
luminosity function shown to be consistent with a semi-analytic, forward
evolution model.

28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat