Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Smoke in the "Smoke Rings": ISO Observations of Dust in Collisional Ring
  Galaxies   Collisional ring galaxies probably result from a head-on collision between a
compact companion galaxy and a gas-rich disk system. We present a review of the
discovery of warm dust in five collisional rings observed by ISO which range in
total Far-IR luminosity from 10$^{10}$~ $<$ ~L$_{FIR}$ ~$<$ ~10$^{11}$
L$\odot$. The results show that in most cases, the mid-IR (MIR) flux is often a
significant fraction of the total energy budget of star formation activity in
these galaxies (at least 10% even in the least powerful cases). We argue that
the MIR emission, when combined with optical and radio observations, allows us
to build a more complete picture of activity in these collisional systems.
Although not as extreme as ULIRGs, these collisional systems provide
low-redshift examples of the early effects of galaxy collisions on the ISM and
may be relevant to the collisional assembly of galaxy disk components at high
redshift.

25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg