Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gems of the Galaxy Zoos -- a Wide-Ranging Hubble Space Telescope
  Gap-Filler Program   We describe the Gems of the Galaxy Zoos (Zoo Gems) project, a gap-filler
project using short windows in the Hubble Space Telescope's schedule. As with
previous snapshot programs, targets are taken from a pool based on position; we
combine objects selected by volunteers in both the Galaxy Zoo and Radio Galaxy
Zoo citizen-science projects. Zoo Gems uses exposures with the Advanced Camera
for Surveys (ACS) to address a broad range of topics in galaxy morphology,
interstellar-medium content, host galaxies of active galactic nuclei, and
galaxy evolution. Science cases include studying galaxy interactions, backlit
dust in galaxies, post-starburst systems, rings and peculiar spiral patterns,
outliers from the usual color-morphology relation, Green Pea compact starburst
systems, double radio sources with spiral host galaxies, and extended
emission-line regions around active galactic nuclei. For many of these science
categories, final selection of targets from a larger list used public input via
a voting process. Highlights to date include the prevalence of tightly-wound
spiral structure in blue, apparently early-type galaxies, a nearly complete
Einstein ring from a group lens, redder components at lower surface brightness
surrounding compact Green Pea starbursts, and high-probability examples of
spiral galaxies hosting large double radio sources.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci