Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The HI content of elliptical and lenticular galaxies with recent star
  formation   As a first step toward constraining the efficiency of the star formation
episodes that lead to elliptical (E) and lenticular (S0) K+A galaxies, a survey
for HI within a sample of E and S0 K+A galaxies and their likely progenitors
(i.e., actively star forming E and S0 galaxies) has been conducted with the
NRAO Green Bank Telescope (GBT). The sample was taken from a larger parent
sample drawn from the Sloan Digital Sky Survey (SDSS). Here, the GBT data and
initial results are discussed. Over half (19 out of 30) of all observed
galaxies have detectable 21-cm emission. It was found that both the K+A and
star forming early-type (SFE) galaxies were on average more gas poor than disk
galaxies at the same luminosity while being more gas rich than more typical E
and S0 galaxies with detected 21-cm emission. The gas richness of K+A galaxies
appears to be similar to that of SFE galaxies. The star formation rates and
estimated star formation time scales of the SFE galaxies imply that they are
capable of only marginally changing their atomic hydrogen content. Follow-up
observations are required to explore these same issues in terms of molecular
gas, which is more likely to actively participate in the star formation
process. Kinematic data for the HI gas, the warm ionised gas, and the stars
within the galaxies combined with the SDSS $g$ and $i$ band surface brightness
profiles imply that the atomic hydrogen is most likely spatially coincident
with the star forming regions within ~1 kpc of the galaxies' centres.

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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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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: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg