Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Host Galaxies of Narrow-Line Seyfert 1s: Nuclear Dust Morphology and
  Starburst Rings   We present a study of the nuclear morphology of a sample of narrow- and
broad-line Seyfert 1 galaxies (NLS1's and BLS1's) based on broad-band images in
the Hubble Space Telescope archives. In our previous study, we found that
large-scale stellar bars at > 1 kpc from the nucleus are more common in NLS1's
than BLS1's. In this paper we find that NLS1's preferentially have grand-design
dust spirals within approx. 1 kpc of their centers. We also find that NLS1's
have a higher fraction of nuclear star-forming rings than BLS1's. We find that
many of the morphological differences are due to the presence or absence of a
large-scale stellar bar within the spiral host galaxy. In general, barred
Seyfert 1s tend to have grand-design dust spirals at their centers, confirming
the results of other researchers. The high fraction of grand-design nuclear
dust spirals and stellar nuclear rings observed in NLS1's host galaxies
suggests a means for efficient fueling of their nuclei to support their high
Eddington ratios.

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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph