Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray observations of the starburst galaxy NGC 253:II. Extended emission
  from hot gas in the nuclear area, disk, and halo   Spatial and spectral analysis of deep ROSAT HRI and PSPC observations of the
near edge-on starburst galaxy NGC 253 reveal diffuse soft X-ray emission, which
contributes 80% to its total X-ray luminosity (L$_{\rm X} = 5 10^{39}$ \ergsec,
corrected for foreground absorption). The nuclear area, disk, and halo
contribution to the luminosity is about equal. The starburst nucleus itself is
highly absorbed and not visible in the ROSAT band.
  We describe in detail spectra and morphology of the emission from the nuclear
area, disk and halo and compare our results to observations at other
wavelengths and from other galaxies. (abridged)

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The categories of this paper are: stat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
3
The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: eess
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org