Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust and gas in luminous infrared galaxies - results from SCUBA
  observations   We present new data taken at 850 $\mu$m with SCUBA at the JCMT for a sample
of 19 luminous infrared galaxies. Fourteen galaxies were detected. We have used
these data, together with fluxes at 25, 60 and 100 $\mu$m from IRAS, to model
the dust emission. We find that the emission from most galaxies can be
described by an optically thin, single temperature dust model with an exponent
of the dust extinction coefficient ($k_\lambda \propto \lambda^{-\beta}$) of
$\beta \simeq 1.5 - 2$. A lower $\beta\simeq 1$ is required to model the dust
emission from two of the galaxies, Arp 220 and NGC 4418. We discuss various
possibilities for this difference and conclude that the most likely is a high
dust opacity. In addition, we compare the molecular gas mass derived from the
dust emission, $M_{dust}$, with the molecular gas mass derived from the CO
emission, $M_{CO}$, and find that $M_{CO}$ is on average a factor 3 higher than
$M_{dust}$.

27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph