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Confirmation of high deuterium abundance in QSO absorbers

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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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M. Rugers, C. J. Hogan (University of Washington)

Astrophysics · Submitted 1 Dec 1995

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

The authors' main claim The abundance is measured to be $D/H$ $ = 1.9 \pm 0.5$ and $1.9 \pm 0.4 \times 10^{-4}$ in the two components, with an independent lower limit of D/H $> 1.3 \times 10^{-4}$ for the sum, derived from the Lyman Limit opacity.

how it is stated · asserted 1.00 read the record →

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arXiv IDastro-ph/9512004 (version 2)
Pith IDLZ5W6YXW, Pith's permanent record of this paper and its review
CitationC. J. Hogan (University of Washington), M. Rugers. "Confirmation of high deuterium abundance in QSO absorbers." arXiv:astro-ph/9512004 (1995). https://pith.science/paper/LZ5W6YXW
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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-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,417 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.41 · human participants 0.01 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.13 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

We present a new analysis of a Keck spectrum of Q0014+813, with a new model of the $z=3.32$ absorbing cloud. We fit Lyman series absorption of the dominant HI components, including components identified with hydrogen and associated deuterium at two discrete velocities, with thermal line broadening of each species. The deuterium features are too narrow to be interlopers, and the good agreement in temperature and redshift with their hydrogen counterparts confirms the identification as deuterium. The abundance is measured to be $D/H$ $ = 1.9 \pm 0.5$ and $1.9 \pm 0.4 \times 10^{-4}$ in the two components, with an independent lower limit of D/H $> 1.3 \times 10^{-4}$ for the sum, derived from the Lyman Limit opacity. The impact on cosmological theory is briefly discussed.

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 a new analysis of a Keck spectrum of Q0014+813, with a new model of the $z=3.32$ absorbing cloud. contribution 0.98 0.94 0.03 asserted 0.89
s1 We fit Lyman series absorption of the dominant HI components, including components identified with hydrogen and associated deuterium at two discrete velocities, with thermal line broadening of each species. method 0.99 0.94 0.03 asserted 0.95
s2 The deuterium features are too narrow to be interlopers, and the good agreement in temperature and redshift with their hydrogen counterparts confirms the identification as deuterium. interpretation 0.69 0.91 0.20 asserted 1.00
s3 The abundance is measured to be $D/H$ $ = 1.9 \pm 0.5$ and $1.9 \pm 0.4 \times 10^{-4}$ in the two components, with an independent lower limit of D/H $> 1.3 \times 10^{-4}$ for the sum, derived from the Lyman Limit opacity. result 1.00 0.96 0.82 asserted 1.00
s4 The impact on cosmological theory is briefly discussed. interpretation 1.00 0.43 0.02 unclear 0.89

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from analysis of existing data 0.92.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
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 a new analysis of a Keck spectrum of Q0014+813, with a new model of the $z=3.32$ absorbing cloud. We fit Lyman series absorption of the dominant HI components, including components identified with hydrogen and associated deuterium at two discrete velocities, with thermal line broadening of each species. The deuterium features are too narrow to be interlopers, and the good agreement in temperature and redshift with their hydrogen counterparts confirms the identification as deuterium. The abundance is measured to be $D/H$ $ = 1.9 \pm 0.5$ and $1.9 \pm 0.4 \times 10^{-4}$ in the two components, with an independent lower limit of D/H $> 1.3 \times 10^{-4}$ for the sum, derived from the Lyman Limit opacity. The impact on cosmological theory is briefly discussed.

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Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

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