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Physical Conditions in the Broad Line Region of $z\sim3$ Quasars: A Photoionization Method to Derive $r_{BLR}$

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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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C. Alenka Negrete, Deborah Dultzin, Paola Marziani, Jack Sulentic

Cosmology and Nongalactic Astrophysics · Submitted 18 Nov 2010

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

The authors' main claim The \rb\ estimate and the assumption of virialized motions in the line emitting gas yields an estimate for black hole mass.

how it is stated · asserted 0.97 read the record →

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arXiv ID1011.4248 (version 2)
Pith IDFNCOEYKA, Pith's permanent record of this paper and its review
CitationC. Alenka Negrete, Deborah Dultzin, Jack Sulentic, Paola Marziani. "Physical Conditions in the Broad Line Region of $z\sim3$ Quasars: A Photoionization Method to Derive $r_{BLR}$." arXiv:1011.4248 (2010). https://pith.science/paper/FNCOEYKA
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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.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,824 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.15 · human participants 0.02 · controlled comparison 0.21 · randomized assignment 0.01 · states quantitative result 0.09 · compares with prior results 0.98 · 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 high S/N UV spectra for eight quasars at $z\sim3$\ obtained with VLT/FORS. The spectra enable us to analyze in detail the strongest emission features in the rest-frame range 1400-2000 \AA\ of each source (\ciii, \siiii, \aliii, \siii, \civ\ and \siiv). Previous work indicates that a component of these lines is emitted in a region with well-defined properties i.e., a high density and low ionization emitting region). Flux ratios \aliii/\siiii, \civ/\aliii, \siiv/\siiii, \civ/\siiv\ and \siii/\siiii\ for this region permit us to strongly constrain electron density, ionization parameter and metallicity through the use of diagnostic maps built from {\sc CLOUDY} simulations. Reliable estimates of the product density times ionization parameter allow us to derive the radius of the broad line region \rb\ from the definition of the ionization parameter. The \rb\ estimate and the assumption of virialized motions in the line emitting gas yields an estimate for black hole mass. We compare our results with estimates obtained from the \rb\ -- luminosity correlation customarily employed to estimate black hole masses of high 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 high S/N UV spectra for eight quasars at $z\sim3$\ obtained with VLT/FORS. method 0.58 0.97 0.02 asserted 1.00
s1 The spectra enable us to analyze in detail the strongest emission features in the rest-frame range 1400-2000 \AA\ of each source (\ciii, \siiii, \aliii, \siii, \civ\ and \siiv). method 0.68 0.91 0.02 asserted 0.97
s2 Previous work indicates that a component of these lines is emitted in a region with well-defined properties i.e., a high density and low ionization emitting region). background 1.00 0.03 0.04 hedged possibility 0.97
s3 Flux ratios \aliii/\siiii, \civ/\aliii, \siiv/\siiii, \civ/\siiv\ and \siii/\siiii\ for this region permit us to strongly constrain electron density, ionization parameter and metallicity through the use of diagnostic maps built from {\sc CLOUDY} simulations. method 0.99 0.71 0.08 asserted 0.99
s4 Reliable estimates of the product density times ionization parameter allow us to derive the radius of the broad line region \rb\ from the definition of the ionization parameter. method 0.93 0.87 0.19 asserted 0.99
s5 The \rb\ estimate and the assumption of virialized motions in the line emitting gas yields an estimate for black hole mass. method 0.79 0.81 0.17 asserted 0.97
s6 We compare our results with estimates obtained from the \rb\ -- luminosity correlation customarily employed to estimate black hole masses of high redshift quasars. contribution 0.45 0.85 0.10 asserted 0.89

What kind of paper the classifier reports this is: empirical study 0.60 · evidence from observation or experiment 0.99.

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 high S/N UV spectra for eight quasars at $z\sim3$\ obtained with VLT/FORS. The spectra enable us to analyze in detail the strongest emission features in the rest-frame range 1400-2000 \AA\ of each source (\ciii, \siiii, \aliii, \siii, \civ\ and \siiv). Previous work indicates that a component of these lines is emitted in a region with well-defined properties i.e., a high density and low ionization emitting region). Flux ratios \aliii/\siiii, \civ/\aliii, \siiv/\siiii, \civ/\siiv\ and \siii/\siiii\ for this region permit us to strongly constrain electron density, ionization parameter and metallicity through the use of diagnostic maps built from {\sc CLOUDY} simulations. Reliable estimates of the product density times ionization parameter allow us to derive the radius of the broad line region \rb\ from the definition of the ionization parameter. The \rb\ estimate and the assumption of virialized motions in the line emitting gas yields an estimate for black hole mass. We compare our results with estimates obtained from the \rb\ -- luminosity correlation customarily employed to estimate black hole masses of high redshift quasars.

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References
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1 arXiv paper cite this in 1 sentence

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

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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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