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Astrophysics · arXiv:astro-ph/0403040 v1 · submitted 1 Mar 2004

The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity function

S.M. Croom (1), R.J. Smith (2), B.J. Boyle (1), T. Shanks (3), L. Miller (4), P.J. Outram (3), N.S. Loaring (4, 5) ((1) Anglo-Australian Observatory

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(2) Liverpool JMU, (3) Durham, (4) Oxford, (5) MSSL)

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The paper says

“For a flat, Omega_m=0.3 and Omega_lam=0.7, Universe, we find that a double power law with luminosity evolution that is exponential in look-back time, t, of the form L*(z) exp(6.15t), equivalent to an e-folding time of 2Gyr, provides an acceptable fit to the redshift dependence of the QSO luminosity function over the range 0.4 < z < 2.1 and M_bJ<-22.5.”

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The paper

Abstract

We present the final catalogue of the 2dF QSO Redshift Survey (2QZ), based on Anglo-Australian Telescope 2dF spectroscopic observations of 44576 colour-selected (u b_J r) objects with 18.25<b_J<20.85 selected from APM scans of UK Schmidt Telescope (UKST) photographic plates. The 2QZ comprises 23338 QSOs, 12292 galactic stars (including 2071 white dwarfs) and 4558 compact narrow-emission-line galaxies. We obtained a reliable spectroscopic identification for 86 per cent of objects observed with 2dF. We also report on the 6dF QSO Redshift Survey (6QZ), based on UKST 6dF observations of 1564 brighter 16<b_J<18.25 sources selected from the same photographic input catalogue. In total, we identified 322 QSOs spectroscopically in the 6QZ. The completed 2QZ is, by more than a factor 50, the largest homogeneous QSO catalogue ever constructed at these faint limits (b_J<20.85) and high QSO surface densities (35 QSOs deg^-2). As such it represents an important resource in the study of the Universe at moderate-to-high redshifts. As an example of the results possible with the 2QZ, we also present our most recent analysis of the optical QSO luminosity function and its cosmological evolution with redshift. For a flat, Omega_m=0.3 and Omega_lam=0.7, Universe, we find that a double power law with luminosity evolution that is exponential in look-back time, t, of the form L*(z) exp(6.15t), equivalent to an e-folding time of 2Gyr, provides an acceptable fit to the redshift dependence of the QSO luminosity function over the range 0.4 < z < 2.1 and M_bJ<-22.5. Evolution described by a quadratic in redshift is also an acceptable fit, with L*(z) 10^(1.39z-0.29z^2).

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

How the main claim is stated: asserted 0.84

What the abstract itself states, as probabilities: claims first 0.16 · states limitation 0.27 · human participants 0.02 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.64 · mentions code or data availability 0.04

The abstract, sentence by sentence

This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.

SentenceRoleThe authors' own workStates the main conclusionStrength
We present the final catalogue of the 2dF QSO Redshift Survey (2QZ), based on Anglo-Australian Telescope 2dF spectroscopic observations of 44576 colour-selected (u b_J r) objects with 18.25<b_J<20.85 selected from APM scans of UK Schmidt Telescope (UKST) photographic plates. contribution 0.88 0.95 0.07 asserted 1.00
The 2QZ comprises 23338 QSOs, 12292 galactic stars (including 2071 white dwarfs) and 4558 compact narrow-emission-line galaxies. result 0.83 0.87 0.06 asserted 1.00
We obtained a reliable spectroscopic identification for 86 per cent of objects observed with 2dF. result 0.93 0.96 0.05 asserted 1.00
We also report on the 6dF QSO Redshift Survey (6QZ), based on UKST 6dF observations of 1564 brighter 16<b_J<18.25 sources selected from the same photographic input catalogue. contribution 0.79 0.87 0.03 asserted 0.99
In total, we identified 322 QSOs spectroscopically in the 6QZ. result 0.96 0.96 0.03 asserted 1.00
The completed 2QZ is, by more than a factor 50, the largest homogeneous QSO catalogue ever constructed at these faint limits (b_J<20.85) and high QSO surface densities (35 QSOs deg^-2). interpretation 0.60 0.82 0.31 asserted 1.00
As such it represents an important resource in the study of the Universe at moderate-to-high redshifts. interpretation 0.99 0.20 0.12 asserted 1.00
As an example of the results possible with the 2QZ, we also present our most recent analysis of the optical QSO luminosity function and its cosmological evolution with redshift. contribution 0.99 0.92 0.08 asserted 0.82
For a flat, Omega_m=0.3 and Omega_lam=0.7, Universe, we find that a double power law with luminosity evolution that is exponential in look-back time, t, of the form L*(z) exp(6.15t), equivalent to an e-folding time of 2Gyr, provides an acceptable fit to the redshift dependence of the QSO luminosity function over the range 0.4 < z < 2.1 and M_bJ<-22.5. result 1.00 0.96 0.33 asserted 0.84
Evolution described by a quadratic in redshift is also an acceptable fit, with L*(z)~10^(1.39z-0.29z^2). result 1.00 0.86 0.11 asserted 0.74

What kind of paper the classifier reports this is: dataset or benchmark 1.00 · evidence from observation or experiment 0.95

What was examined, and what was not

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How the labels were made

Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 8,151 input tokens.

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON

Cited by 3 Pith papers

Reviewed papers on Pith that cite this one. The full citation record

  1. Correlation of CMB with large-scale structure: I. ISW Tomography and Cosmological Implications astro-ph · Jan 2008
  2. The Cosmic Energy Inventory astro-ph · Jun 2004
  3. AllBRICQS: the All-sky BRIght, Complete Quasar Survey - Quasar Selection and Final Southern $G_{\rm RP}<16$ Sample astro-ph.GA · Oct 2026
How later papers used it

62 later papers cite it

Evidence: substantial. 57 of the citing papers share no author with it, and 16 of those carry a confident label from Pith's citation classifier.

Pith read 23 of the 72 citing sentences, choosing only those whose citation markers point at this paper alone, and wrote the paraphrases from them. The summary, the counts, the evidence level, the links and the quotes come from code; the summary counts the papers listed below. A later paper is listed under a label when Pith's citation classifier gives one of its sentences that label at probability 0.8 or more (0.95 for support), Pith's reading finds that the citing paper itself did it, and a second check confirms the paraphrase against the sentence. This section lists uses only. It does not list criticism or disagreement, so their absence here says nothing about how the paper has been received. Papers that share an author with this one are listed apart, under "By the same authors". A quote is the citing authors' own sentence, shown when their paper's licence is CC BY, CC BY-SA or CC0. JSON

Uses its data or values 7 of 15 papers with this label · 1 by the same authors

By the same authors

How the literature uses it

8 arXiv papers cite this in 10 sentences

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

Papers citing it · 4 sentences without a confident label

Uses its data or values 3 papers
  • Next we add the full quasar catalog from the 2QZ project [ref] [www.2dfquasar.org/Spec_Cat/cat/2QZ_6QZ_pubcat.txt].

    Bayesian High-Redshift Quasar Classification from Optical and Mid-IR Photometry · Master Catalog of Quasars with SDSS Photometry · 1.00

  • We do this numerically by populating each $(1.5 h^-1Gpc)^3$ box with mock quasars with luminosities following a broken power-law luminosity function [equation] with the parameters detailed in Table 5 of [ref] .

    The Acoustic Peak in the Lyman Alpha Forest · Fluctuating photo-ionization rate · 0.83

  • This dataset is a “catalog of catalogs" consisting of sources within the SDSS-I/II/III survey areas and draws objects from the following sources: * SDSS I/II: [ref] * 2QZ: [ref] * 2SLAQ: [ref] * AUS: Croom et al. (in prep.) * AGES: [ref] * COSMOS: [ref] * SDSS-III: [ref] * [ref] Photometric Catalog * [ref] Photometric Catalog * [ref] * [ref] * [ref]

    Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission · Master Quasar Catalog · 0.80

Compares with it 1 paper
Cites it as background 2 papers

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