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ROSAT HRI observations of seven high redshift quasars

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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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J. Siebert, W. Brinkmann (Max-Planck-Institut f. extraterrestrische Physik, MPE)

Astrophysics · Submitted 9 Feb 1998

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

The authors' main claim S4 0620+389, B1422+231, PKS 2215+02 and BG 57 9 are detected in the ROSAT energy band (0.1-2.4 keV). 2 sigma upper limits are given for the remaining objects.

how it is stated · asserted 1.00 read the record →

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arXiv IDastro-ph/9802101 (version 1)
Pith IDI2S4INBJ, Pith's permanent record of this paper and its review
CitationJ. Siebert, MPE), W. Brinkmann (Max-Planck-Institut f. extraterrestrische Physik. "ROSAT HRI observations of seven high redshift quasars." arXiv:astro-ph/9802101 (1998). https://pith.science/paper/I2S4INBJ
Claim paper

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.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,881 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.79 · human participants 0.01 · controlled comparison 0.81 · randomized assignment 0.01 · states quantitative result 0.96 · compares with prior results 0.92 · 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 ROSAT HRI observations of six quasars with redshifts >3.4: PKS 0335-122, S4 0620+389, B1422+231, PKS 2215+02, Q 2239-386 and PC 2331+0216. We include the observation of the radio-quiet quasar BG 57 9, whose redshift has recently been revised to z = 0.965. S4 0620+389, B1422+231, PKS 2215+02 and BG 57 9 are detected in the ROSAT energy band (0.1-2.4 keV). 2 sigma upper limits are given for the remaining objects. All X-ray sources are point like to the limit of the HRI point spread function. We report marginal evidence for X-ray variability in S4 0620+389 on timescales of several hours (rest frame). No significant X-ray variability is found in the gravitationally lensed quasar B1422+231 on rest frame timescales of hours and months. We present the spectral energy distributions for six of the high redshift quasars and compare them to the mean distribution of low redshift quasars.

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 ROSAT HRI observations of six quasars with redshifts >3.4: PKS 0335-122, S4 0620+389, B1422+231, PKS 2215+02, Q 2239-386 and PC 2331+0216. contribution 0.99 0.95 0.05 asserted 1.00
s1 We include the observation of the radio-quiet quasar BG 57 9, whose redshift has recently been revised to z = 0.965. contribution 0.98 0.56 0.03 asserted 1.00
s2 S4 0620+389, B1422+231, PKS 2215+02 and BG 57 9 are detected in the ROSAT energy band (0.1-2.4 keV). 2 sigma upper limits are given for the remaining objects. result 1.00 0.95 0.17 asserted 1.00
s3 All X-ray sources are point like to the limit of the HRI point spread function. result 1.00 0.92 0.09 asserted 1.00
s4 We report marginal evidence for X-ray variability in S4 0620+389 on timescales of several hours (rest frame). result 1.00 0.95 0.09 hedged possibility 0.93
s5 No significant X-ray variability is found in the gravitationally lensed quasar B1422+231 on rest frame timescales of hours and months. result 1.00 0.95 0.08 asserted 1.00
s6 We present the spectral energy distributions for six of the high redshift quasars and compare them to the mean distribution of low redshift quasars. contribution 0.87 0.95 0.13 asserted 0.99

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.98.

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 ROSAT HRI observations of six quasars with redshifts >3.4: PKS 0335-122, S4 0620+389, B1422+231, PKS 2215+02, Q 2239-386 and PC 2331+0216. We include the observation of the radio-quiet quasar BG 57 9, whose redshift has recently been revised to z = 0.965. S4 0620+389, B1422+231, PKS 2215+02 and BG 57 9 are detected in the ROSAT energy band (0.1-2.4 keV). 2 sigma upper limits are given for the remaining objects. All X-ray sources are point like to the limit of the HRI point spread function. We report marginal evidence for X-ray variability in S4 0620+389 on timescales of several hours (rest frame). No significant X-ray variability is found in the gravitationally lensed quasar B1422+231 on rest frame timescales of hours and months. We present the spectral energy distributions for six of the high redshift quasars and compare them to the mean distribution of low redshift quasars.

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