Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Evolution of Galaxy Morphology for Galaxies in the Canada-France
  Redshift Survey   The images of 229 galaxies in the Canada France Redshift Survey have been
classified on the DDO system. These observations were combined with previous
classifications of galaxies with known redshifts in the Hubble Deep Field. The
combined sample provides homogeneous morphological classifications for 425
galaxies of known redshift. The fraction of all galaxies that are of types E +
S0 + E/S0 appears to remain approximately constant at ~17% over the redshift
range 0.25 < z < 1.2. Over the same range the fraction of irregular (Ir)
galaxies increases from ~5% to ~12%. Part of this increase may be due to mild
luminosity evolution of Ir galaxies. The frequency of mergers is found to rise
by a factor of two or three over the redshift range covered by the present
survey.

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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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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: patt-sol
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The categories of this paper are: gr-qc