Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate
  selection and follow-up   We report the final results of the search for gravitationally lensed
flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All
Sky Survey) and JVAS (Jodrell-Bank VLA Astrometric Survey). VLA observations of
16,503 sources have been made, resulting in the largest sample of arcsec-scale
lens systems available. Contained within the 16,503 sources is a complete
sample of 11,685 sources having two-point spectral indices between 1.4 and 5
GHz flatter than -0.5 and 5 GHz flux densities $\geq$30 mJy. A subset of 8,958
sources form a well-defined statistical sample suitable for analysis of the
lens statistics. We describe the systematic process by which 149 candidate
lensed sources were picked from the statistical sample on the basis of
possessing multiple compact components in the 0.2 arcsec-resolution VLA maps.
Candidates were followed up with 0.05 arcsec resolution MERLIN and 0.003 arcsec
VLBA observations at 5 GHz and rejected as lens systems if they failed
well-defined surface brightness and/or morphological tests. Maps for all the
candidates can be found on the World Wide Web at
http://www.jb.man.ac.uk/research/gravlens/index.html We summarize the
properties of each of the 22 gravitational lens systems in JVAS/CLASS. Twelve
are double-image systems, nine are four-image systems and one is a six-image
system. Thirteen constitute a statistically well-defined sample giving a
point-source lensing rate of 1:690$\pm$190. The interpretation of the results
in terms of the properties of the lensing galaxy population and cosmological
parameters will be published elsewhere. (Abridged)

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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: hep-ex