Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of Candidate z=1.54 Quasar Host Clusters   We present new data on several z=1.54 radio-loud quasar fields from a sample
of 31 at z=1-2 in which we have previously identified an excess population of
predominantly red galaxies. Narrow-band H-alpha observations detect five
candidate galaxies at the quasar redshifts in three fields totaling 10.156
arcmin^2, a surface density 30 times higher than in previous surveys, even
targeted ones. SCUBA observations of three fields detect at least one candidate
quasar-associated galaxy. Many galaxies with SEDs indicating considerable dust
are not detected, but the limits are only sufficient to rule out hyperluminous
infrared galaxies. Finally, quantitative photometric redshifts and SED fits are
presented for one "J-band dropout" galaxy with J-K>2.5 which is confirmed to be
very dusty (E(B-V)~=0.5) and background to the quasar at >99.9% confidence.

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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
2
The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ