Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is B1422+231 a Golden Lens?   B1422+231 is a quadruply-imaged QSO with an exceptionally large lensing
contribution from group galaxies other than the main lensing galaxy. We detect
diffuse X-rays from the galaxy group in archival Chandra observations; the
inferred temperature is consistent with the published velocity dispersion. We
then explore the range of possible mass maps that would be consistent with the
observed image positions, radio fluxes, and ellipticities. Under plausible but
not very restrictive assumptions about the lensing galaxy, predicted time
delays involving the faint fourth image are fairly well constrained around 7/h
days.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an