Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interaction of supernova blast waves with wind-driven shells: formation
  of "jets", "bullets", "ears", etc   Most of middle-aged supernova remnants (SNRs) have a distorted and
complicated appearance which cannot be explained in the framework of the
Sedov-Taylor model. We consider three typical examples of such SNRs (Vela SNR,
MSH 15-52, G 309.2-00.6) and show that their structure could be explained as a
result of interaction of a supernova (SN) blast wave with the ambient medium
preprocessed by the action of the SN progenitor's wind and ionized emission.

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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas