Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Photometrically and Spectroscopically Confirmed Population of Passive
  Spiral Galaxies   We have identified a population of passive spiral galaxies from photometry
and integral field spectroscopy. We selected z<0.035 spiral galaxies that have
WISE colours consistent with little mid-infrared emission from warm dust.
Matched aperture photometry of 51 spiral galaxies in ultraviolet, optical and
mid-infrared show these galaxies have colours consistent with passive galaxies.
Six galaxies form a spectroscopic pilot study and were observed using the
Wide-Field Spectrograph (WiFeS) to check for signs of nebular emission from
star formation. We see no evidence of substantial nebular emission found in
previous red spiral samples. These six galaxies possess absorption-line spectra
with 4000\AA\ breaks consistent with an average luminosity-weighted age of 2.3
Gyr. Our photometric and IFU spectroscopic observations confirm the existence
of a population of local passive spiral galaxies, implying that transformation
into early-type morphologies is not required for the quenching of star
formation.

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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom