Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: XMM-Newton EPIC Observation of SMC SNR 0102-72.3   Results from observations of the young oxygen-rich supernova remnant SNR
0102-72.3 in the Small Magellanic Cloud during the calibration phase of the
XMM-Newton Observatory are presented. Both EPIC-PN and MOS observations show a
ringlike structure with a radius of ~15'' already known from Einstein, ROSAT
and Chandra observations. Spectra of the entire SNR as well as parts in the
eastern half were analyzed confirming shocked hot plasma in non-uniform
ionization stages as the origin of the X-ray emission. The spectra differ in
the northeastern and the southeastern part of the X-ray ring, showing emission
line features of different strength. The temperature in the northeastern part
is significantly higher than in the southeast, reflected by the lines of higher
ionization stages and the harder continuum. Comparison to radio data shows the
forward shock of the blast wave dominating in the northern part of the SNR,
while the southern emission is most likely produced by the recently formed
reverse shock in the ejecta. In the case of the overall spectrum of SNR
0102-72.3, the two-temperature non-equilibrium ionization model is more
consistent with the data in comparison to the single plane-parallel shock
model. The structure of SNR 0102-72.3 is complex due to variations in shock
propagation leading to spatially differing X-ray spectra.

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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics