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Search for Galaxy Clustering around a Quasar Pair at z=4.25 found in the Sloan Digital Sky Survey

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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Masataka Fukugita, Osamu Nakamura, Donald P. Schneider, Mamoru Doi, Nobunari Kashikawa

Astrophysics · Submitted 19 Dec 2003

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We infer that bright quasars happened to appear in two normal galaxies in a general field.

how it is stated · asserted 0.49 read the record →

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arXiv IDastro-ph/0312521 (version 1)
Pith IDGZ76UGFD, Pith's permanent record of this paper and its review
CitationDonald P. Schneider, Mamoru Doi, Masataka Fukugita, Nobunari Kashikawa, Osamu Nakamura. "Search for Galaxy Clustering around a Quasar Pair at z=4.25 found in the Sloan Digital Sky Survey." arXiv:astro-ph/0312521 (2003). https://pith.science/paper/GZ76UGFD
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,450 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.75 · human participants 0.01 · controlled comparison 0.72 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.45 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

We present an investigation of the environment (\approx 600 kpc radius) of a pair of luminous z=4.25 quasars, SDSS J1439-0034 A,B, separated by 33''. An analysis of high-quality Subaru spectra of the quasars suggests that this configuration is indeed a physical pair and not a gravitational lens; the redshifts are slightly different (although marginally consistent with being the same), and the two spectra have strikingly different features. We search for bright galaxies (L\gsim 0.4 L^*) having similar redshifts using the V dropout technique and semi-narrow band imaging looking for strong Ly alpha emission. We find no enhancement in the galaxy density around the quasar pair; its environment differs very little from a general field, with the upper limit of the density enhancement being about 3 at a 90% confidence. We infer that bright quasars happened to appear in two normal galaxies in a general field.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We present an investigation of the environment (\approx 600 kpc radius) of a pair of luminous z=4.25 quasars, SDSS J1439-0034 A,B, separated by 33''. contribution 1.00 0.88 0.03 asserted 0.94
s1 An analysis of high-quality Subaru spectra of the quasars suggests that this configuration is indeed a physical pair and not a gravitational lens; the redshifts are slightly different (although marginally consistent with being the same), and the two spectra have strikingly different features. result 0.90 0.92 0.04 hedged possibility 0.86
s2 We search for bright galaxies (L\gsim 0.4 L^*) having similar redshifts using the V dropout technique and semi-narrow band imaging looking for strong Ly alpha emission. method 1.00 0.93 0.02 asserted 0.87
s3 We find no enhancement in the galaxy density around the quasar pair; its environment differs very little from a general field, with the upper limit of the density enhancement being about 3 at a 90% confidence. result 1.00 0.97 0.57 asserted 1.00
s4 We infer that bright quasars happened to appear in two normal galaxies in a general field. interpretation 1.00 0.82 0.90 asserted 0.49

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.92.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

We present an investigation of the environment (\approx 600 kpc radius) of a pair of luminous z=4.25 quasars, SDSS J1439-0034 A,B, separated by 33''. An analysis of high-quality Subaru spectra of the quasars suggests that this configuration is indeed a physical pair and not a gravitational lens; the redshifts are slightly different (although marginally consistent with being the same), and the two spectra have strikingly different features. We search for bright galaxies (L\gsim 0.4 L^*) having similar redshifts using the V dropout technique and semi-narrow band imaging looking for strong Ly alpha emission. We find no enhancement in the galaxy density around the quasar pair; its environment differs very little from a general field, with the upper limit of the density enhancement being about 3 at a 90% confidence. We infer that bright quasars happened to appear in two normal galaxies in a general field.

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