Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerically investigating the peculiar periphery of a supernova remnant
  in the medium with a density gradient: the case of RCW 103   The young shell-type supernova remnant RCW 103 has peculiar properties in the
X-ray morphology obtained with Chandra. The southeastern shell is more brighter
in the X-rays, and the curved border of the shell in this region is more
flatten than the other part. We investigate the formation of the peculiar
periphery of the supernova remnant RCW 103 using 3D hydrodynamical simulation.
Assuming that the supernova ejecta has been evolved in the medium with a
density gradient, the detected shape of the periphery can be generally
reproduced. For RCW 103, with the ejecta mass of $3.0~M_{\odot}$, the density
of the background material of $2.0~\mathrm{cm}^{-3}$, and a gradient of $3.3 -
4.0 ~\mathrm{cm}^{-3} \mathrm{pc}^{-1}$, the X-ray periphery can be generally
reproduced. The simulation turned out that the asymmetry of the SNR RCW 103 is
mainly due to the inhomogeneous medium with a density gradient.

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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: stat
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn