Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stellar Nuclear Rings in Barred Galaxies: Fossils of Past Circumnuclear
  Starbursts?   We have found four barred S0 galaxies -- NGC 936, NGC 3945, NGC 4340, and NGC
4371 -- which contain smooth, luminous, purely stellar nuclear rings within
their bars. These rings have little or no dust, no evidence for recent star
formation, and are approximately the same color as surrounding bar and bulge.
Thus, they are probably the aged remnants of bar-driven circumnuclear starburst
episodes similar to those seen in barred galaxies today.
  Using kinematic data from long-slit spectroscopy, we construct rotation and
resonance curves for two of the galaxies. In both cases, the nuclear rings
appear to be located near or at the inner inner Lindblad resonances of the
large-scale bars.
  We also discuss the difficulties inherent in detecting and identifying such
rings, and show some of the surprising ways in which stellar rings can distort
galaxy isophotes and ellipse fits.

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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: eess
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: nucl-th