Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The CANADA-FRANCE REDSHIFT SURVEY XI: Morphology of high-redshift field
  galaxies from high-resolution ground-based imaging   The 143 galaxies with secure redshifts (median z = 0.62) from the 1415+52
field of the Canada-France Redshift Survey have been imaged at CFHT with median
seeing of 0.67 arcseconds. Structural parameters have been derived by fitting
multi-component models, and the results confirm two phenomena seen in a smaller
sample of galaxies imaged with HST. First, 11% of the galaxies lie off the
normal locus of colour vs. bulge fraction. This class of objects
("blue-nucleated galaxies" or BNGs) was first identified using HST observations
(Schade et al. 1995, Ap J, 451, L1), where it was shown that they are
associated with peculiar or asymmetric structures and mergers/interactions. The
observed frequency of BNGs in this sample is 14% for 0.5 < z < 1.2 and 6% at
0.2 < z < 0.5, but the true frequency is likely to be a factor ~2 higher after
corrections are made for the effect of asymmetric/peculiar structures. Second,
galaxy disks at 0.5 < z < 1.1 are found to have a mean rest-frame,
inclination-corrected, central surface brightness of $\mu_{AB}(B)=19.8 \pm 0.1$
mag arcsec$^{-2}$, about 1.6 mag brighter than the Freeman (1970) value. At low
redshift, the mean surface brightness is consistent with the Freeman value.
These results are consistent with the HST observations. With larger numbers of
galaxies and therefore more statistical weight, they demonstrate the
capabilities, and limits, of ground-based work in the study of galaxy
morphology at high redshift.

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The categories of this paper are: dg-ga
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The categories of this paper are: cs
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
2
The categories of this paper are: math
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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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: alg-geom
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The categories of this paper are: supr-con