Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Semi-Empirical Model of the Infrared Emission from Galaxies   We present a semi-empirical model for the infrared emission of dust around
star-forming sites in galaxies. Our approach combines a simple model of
radiative transfer in dust clouds with a state-of-the-art model of the
microscopic optical properties of dust grains pioneered by Draine & Li. In
combination with the Starburst 99 stellar spectral synthesis package, this
framework is able to produce synthetic spectra for galaxies which extend from
the Lyman limit through to the far-infrared. We use it to probe how model
galaxy spectra depend upon the physical characteristics of their dust grain
populations, and upon the energy sources which heat that dust. We compare the
predictions of our model with the 8- and 24-micron luminosities of sources in
the Spitzer First Look Survey, and conclude by using the models to analyse the
relative merits of various colour diagnostics in distinguishing systems out to
a redshift of 2 with ongoing star formation from those with only old stellar
populations.

29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
9
The categories of this paper are: nlin