Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Interstellar Gas in Rapidly Rotating Elliptical Galaxies:
  Formation of Disks   We describe the evolution of hot interstellar gas in a family of low
luminosity elliptical galaxies all having $M_B = -20$ but with different
degrees of flattening (E0, E2, and E6) caused by rotation. The interstellar gas
is furnished by stellar mass loss. The soft X-ray luminosity Lx of the hot
interstellar gas after 15 Gyrs decreases dramatically with galactic rotation.
The hot gas cools onto a large disk having a size that depends inversely on the
assumed supernova rate. Although Lx of the hot, rotating interstellar gas may
be difficult to observe, the photoionized part of the cooled gaseous disk gas
can be observed in optical line emission. The mass of HII gas ($\sim 10^8$
$M_{\odot}$) may be much greater than previously realized since large regions
of rotationally supported, low density HII are optically faint. We interpret
the stellar disks that are common in low luminosity ellipticals as stars that
have formed in the non-ionized part of the cold disk gas. The total mass and
distribution of cold disk gas available for star formation are similar to those
of stellar disks observed. The high stellar H$\beta$ photometric index observed
in disky ellipticals can be understood by combining the light of young disk
stellar populations with that of the old bulge population.

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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
5
The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph