Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematics and Cloud to Cloud Abundance Ratios: A Rosetta Stone for Disk
  and Halo Components in Mg II Absorbers   Based upon QSO absorption line studies, galaxies at 0.3 < z < 1.0 are seen to
have extended gaseous "halos". When the absorption lines are observed at high
resolution, the velocity distribution of the absorbing gas gives clues as to
where this gas actually arises in and around the galaxies. Cloud to cloud
abundance ratios provide further clues, given that the ionization conditions
and chemical evolution histories of outer halos clouds, spiral disk clouds, and
clouds in elliptical galaxies are different. The key to interpreting the high
redshift data is the Milky Way galaxy, the absorption line "Rosetta stone."

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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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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: atom-ph