Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust Cooling in Supernova Remnants in the Large Magellanic Cloud   The infrared-to-X-ray (IRX) flux ratio traces the relative importance of dust
cooling to gas cooling in astrophysical plasma such as supernova remnants
(SNRs). We derive IRX ratios of SNRs in the LMC using Spitzer and Chandra SNR
survey data and compare them with those of Galactic SNRs. IRX ratios of all the
SNRs in the sample are found to be moderately greater than unity, indicating
that dust grains are a more efficient coolant than gas although gas cooling may
not be negligible. The IRX ratios of the LMC SNRs are systematically lower than
those of the Galactic SNRs. As both dust cooling and gas cooling pertain to the
properties of the interstellar medium, the lower IRX ratios of the LMC SNRs may
reflect the characteristics of the LMC, and the lower dust-to- gas ratio (a
quarter of the Galactic value) is likely to be the most significant factor. The
observed IRX ratios are compared with theoretical predictions that yield IRX
ratios an order of magnitude larger. This discrepancy may originate from the
dearth of dust in the remnants due to either the local variation of the dust
abundance in the preshock medium with respect to the canonical abundance or the
dust destruction in the postshock medium. The non-equilibrium ionization
cooling of hot gas, in particular for young SNRs, may also cause the
discrepancy. Finally, we discuss implications for the dominant cooling
mechanism of SNRs in low-metallicity galaxies.

8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
2
The categories of this paper are: math