Dr16 Quasar Catalog

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MILLIQUAS Million Quasars Catalog, Version 7.2 (2 May 2021)


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7 hours ago Overview. This table contains the Million Quasars (MILLIQUAS) Catalog, Version 7.2 (2 May 2021). It is a compendium of 829,666 type-I QSOs and AGN, largely complete from the literature to 30 April 2021, including the SDSS-DR16Q and VLASS radio catalogs. Also included are 703,348 quasar candidates which are calculated as 60-100% likely to be

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The Sloan Digital Sky Survey Quasar Catalog: Sixteenth


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2 hours ago Abstract. We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). This catalog comprises the largest selection of spectroscopically confirmed quasars to date. The full catalog includes two subcatalogs (the current versions are DR16Q_v4 and

1. 51
Publish Year: 2020
Author: Brad W. Lyke, Alexandra N. Higley, J. N. McLane, Danielle P. Schurhammer, Adam D. Myers, Ashley J. R...
Estimated Reading Time: 2 mins

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The Million Quasars (Milliquas) v7.2 Catalogue, now with


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8 hours ago 3 REDUCTION OF THE SDSS-DR16 QUASAR CATALOGUE The Sloan Digital Sky Survey (SDSS) Quasar Catalogue 16th Data Release (DR16Q:Lyke et al.2020) features a main catalogue (DR16Q_v4.csv) of 750414 quasars which includes earlier SDSS-I/II/III data. About half of the DR16Q objects’ spectra were visu-

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Lymanalpha forest catalog SDSS


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3 hours ago The external name of this HDU is given by the quasar catalog identification integer: EXTNAME=THING_ID. In the file header, the different quantities RA, DEC, Z, THING_ID, PLATE, MJD, FIBERID are propagated from the quasar redshift catalog, where Z is the PCA redshift of DR16.

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The Optical Spectra Catalogs SDSS


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3 hours ago This processing is done separately for the different target classes (lyman-alpha quasar, tracer quasars, LRGs, and ELGs) and one should consult the particular documentation for each of these. The final DR16 redshift information for these samples will be made available after the cosmological studies using their data are completed.

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The Million Quasars (Milliquas) Catalogue, v6


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4 hours ago Announcing the release v6.4 of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 11 December 2019, including SDSS-DR16. Its totals are 757991 type-I QSOs/AGN and approx 1.1M high-con dence (80%+ likelihood) quasar candidates from SDSS-based & AllWISE photometric quasar

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The Sloan Digital Sky Survey Quasar Catalog: fourteenth


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4 hours ago These bugs are fixed in the DR16 Quasar Catalog, which we recommend you use instead. DR14 Quasar Catalog. Following the tradition established by SDSS-I/II/III, the SDSS-IV/eBOSS collaboration produces quasar catalogs for public release. The SDSS-DR14 quasar catalog (DR14Q) was the first to be released that contains new identifications and

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Milliquas million quasars catalogue


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6 hours ago The Million Quasars (Milliquas) catalog, v7.2a, 31 July 2021. MILLIQUAS v7.2a includes quasars from the literature to 31 July 2021, including SDSS-DR16Q quasar data and VLASS radio data. This edition includes 828,749 type-I QSOs & AGN plus ~690K quasar candidates of 60%+ QSO-likelihood -- details are in the ReadMe.

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[1912.05614] The Million Quasars (Milliquas) Catalogue, v6.4


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2 hours ago Announcing the release v6.4 of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 11 December 2019, including SDSS-DR16. Its totals are 757,991 type-I QSOs/AGN and approx 1.1M high-confidence (80%+ likelihood) quasar candidates from SDSS-based & AllWISE photometric quasar catalogs, plus all-sky radio/X-ray associated candidates available only …

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The Million Quasars (Milliquas) Catalogue, v6.4 NASA/ADS


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2 hours ago Announcing the release v6.4 of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 11 December 2019, including SDSS-DR16. Its totals are 757,991 type-I QSOs/AGN and approx 1.1M high-confidence (80%+ likelihood) quasar candidates from SDSS-based & AllWISE photometric quasar catalogs, plus all-sky radio/X-ray associated candidates available only here.

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The Million Quasars (Milliquas) Catalogue, v6.4 – arXiv Vanity


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7 hours ago Milliquas is currently the only quasar catalogue to keep abreast of all the latest quasar discoveries from published papers large & small; this edition v6.4 is current to 11 December 2019 and includes the SDSS-DR16 pipeline catalogue which adds ≈ 160 000 quasars to the literature. The criteria for accepting pipeline quasars and other specifications are as given in the Half Million Quasars

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GitHub jibanCat/gp_dla_detection_dr16q_public: (DR16Q


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7 hours ago The pipeline for GP DR16 DLAs has multiple stages, outlined and documented below. Loading catalogs and downloading spectra. The first step of the process is to load the DR12Q and DR16Q quasar catalog and available DLA catalogs, extract some basic data such as redshift, coordinates, etc., and apply some basic filtering to the spectra:

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The Sloan Digital Sky Survey Quasar Catalog: Sixteenth


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9 hours ago The DR16Q quasar-only catalog contains 183 columns of information for each quasar in a binary FITS (Wells et al. 1981) table file. The DR16Q superset includes the columns listed below up to column 98 inclusive, omitting Z _ LYAWG and M _ I (columns 53 and 97 respectively), but adding PRIM _ REC (column 16 in the superset), which has a value of

1. 51
Publish Year: 2020
Author: Brad W. Lyke, Alexandra N. Higley, J. N. McLane, Danielle P. Schurhammer, Adam D. Myers, Ashley J. R...
Estimated Reading Time: 8 mins

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Legacy Survey Files Legacy Survey


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9 hours ago HDU1 (the only HDU) contains Tractored survey photometry that is row-by-row-matched to the SDSS DR16 visually inspected quasar catalog (Lyke et al. 2020) such that the photometric parameters in row "N" of survey-dr9-<region>-dr16Q-v4.fits match the spectroscopic parameters in row …

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The Sloan Digital Sky Survey Quasar Catalog: Sixteenth


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7 hours ago Search by expertise, name or affiliation. The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release

1. 51
Publish Year: 2020
Author: Brad W. Lyke, Alexandra N. Higley, J. N. McLane, Danielle P. Schurhammer, Adam D. Myers, Ashley J. R...

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SDSS DR16 QSO Based MgII/FeII Absorber Catalogue


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5 hours ago Here we make publicly available the MgII (Mg+) Absorber catalogue based on ~ 1 million quasar spectra from the final SDSS quasar sample (DR16), including all spectra observed through SDSS-IV. The automated absorption detection pipeline is fully described in Anand et al. 2021. There are ~ 160,000 MgII absorbers together with ~ 70,000 FeII (Fe+) confirmed systems in the catalogue.

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Our Projects


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7 hours ago For this project, we consider SDSS DR16 quasar catalog, where the motto is to check variability of quasar emission with respect to wavelength. We will be comparing quasar spectra at different time intervals to detect the changes in emission.

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Broad Absorption Feature Detection in The Sixteenth SDSS


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2 hours ago The full catalog is comprised of two files: a superset of 1,440,615 observations of objects targeted as quasars, and a quasar-only set of 750,414, including 225,082 new quasars that have not appeared in an SDSS data release before Data Release 16 (DR16).

Author: B. W. Lyke, P. Larkin-Gero, A. N. Higley, J. N. McLane, D. P. Schurhammer, A. D. Myers
Publish Year: 2021

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SDSS DR16 — dr16 contains sdss observations through august


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3 hours ago This catalog, which is the largest quasar catalog to date, contains data for 750,414 quasars, of which 225,082 are new. Content in th https://dr16.sdss.org Science Archive Webapp: interactive search-view-download tool for infrared and optical spectra, imaging fields, and image mosaic creation.

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The Completed SDSSIV extended Baryon Oscillation


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2 hours ago Combined, they allow large-scale clustering measurements suitable for testing cosmological models. We describe the methods used to create these catalogs for the eBOSS DR16 Luminous Red Galaxy (LRG) and Quasar samples. The quasar catalog contains 343,708 redshifts with $0.8 < z < 2.2$ over 4,808\,deg$^2$.

1. 29
Publish Year: 2020
Author: Ashley J Ross, Julian Bautista, Rita Tojeiro, Shadab Alam, Stephen Bailey, Etienne Burtin, Johan Com...
Estimated Reading Time: 2 mins

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SDSS SkyServer DR16


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8 hours ago You saw these lines in the quasar spectrum in Question 3. Let's look at the spectra of some quasars and see how they vary. Exercise 2. The table below gives several of the SDSS's quasar spectra by their spectral plate and fiber numbers. Click on the fiber numbers to use SkyServer's Get Spectra tool to view each quasar's spectrum.

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[2007.09000] The Completed SDSSIV extended Baryon


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2 hours ago Combined, they allow large-scale clustering measurements suitable for testing cosmological models. We describe the methods used to create these catalogs for the eBOSS DR16 Luminous Red Galaxy (LRG) and Quasar samples. The quasar catalog contains 343,708 redshifts with $0.8 < z < 2.2$ over 4,808\,deg$^2$.

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Photometric redshifts and quasar probabilities from a


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8 hours ago The spectroscopic sample used in this analysis is obtained with the same methodology as for the large-scale structure DR16 eBOSS quasar catalogue (Ross et al. 2020) but instead of considering

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Identification of BASS DR3 Sources as Stars, Galaxies and


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9 hours ago quasar was identified in the 1960s, astronomers have taken ⋆ Email: [email protected] † Email: [email protected] a lot of efforts to find quasars as many as possible. With the advent of the survey telescopes, a large number of quasars have been discovered in recent 20 years. The sky survey telescopes include the Large Bright Quasar Sur-

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Measuring the cosmic homogeneity scale with SDSSIV DR16


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5 hours ago We report measurements of the scale of cosmic homogeneity (rh) using the recently. released quasar sample of the sixteenth data release of the Sloan Digital Sky Survey (SDSS-IV. DR16). W e perform

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The clustering of the SDSSIV extended Baryon Oscillation


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1 hours ago Combined, they allow large-scale clustering measurements suitable for testing cosmological models. We describe the methods used to create these catalogues for the eBOSS DR16 Luminous Red Galaxy (LRG) and Quasar samples. The quasar catalogue contains 343708 redshifts with 0.8 < z < 2.2 over 4808 deg 2.

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Draft version October 18, 2021 A twocolumn style in


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9 hours ago served as absorption in quasar spectra traces the matter distribution (du Mas des Bourboux et al.2020). We se-lect quasar samples for this study from the nal quasar catalog of DR16 (DR16Q;Lyke et al.2020). This section summarizes the spectroscopic data and selection criteria for the training sample used in our clustering analysis.

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Quasars and Redshift


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9 hours ago The Million Optical Radio/X-ray Associations catalog (MORX: 2016, PASA 33,52) is available here. It maps large-survey radio and X-ray sources onto 1,002,855 optical objects. There also is a supplemental file which adds 118,200 objects to the MORX total. The Half Million Quasars catalog (HMQ: 2015, PASA 32, 10) is available here .

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SDSS SkyServer DR16


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6 hours ago The gas emits thermal radiation due to its enormous heat. This thermal radiation spans the spectrum, making the quasar bright in the visible spectrum as well as x-rays. There is a limit as to how bright a quasar can be, called the Eddington limit, which depends on the mass of the black hole.

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M. VIVEK The InterUniversity Centre for Astronomy and


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4 hours ago We measure the anisotropic clustering of the quasar sample from Data Release 16 (DR16) of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (eBOSS).

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(PDF) The Completed SDSSIV extended Baryon Oscillation


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8 hours ago PDF We present the large-scale structure catalogs from the recently completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). Derived from …

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The Sloan Digital Sky Survey Quasar Catalog: Sixteenth


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7 hours ago The quasar-only catalog is estimated to be 99.8% complete with 0.3%–1.3% contamination. Automated and visual inspection redshifts are supplemented by redshifts derived via principal component analysis and emission lines.

1. 51
Publish Year: 2020
Author: Brad W. Lyke, Alexandra N. Higley, J. N. McLane, Danielle P. Schurhammer, Adam D. Myers, Ashley J. R...

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SDSSIII Baryon Oscillation Spectroscopic Survey data


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1 hours ago Combined, they allow large-scale clustering measurements suitable for testing cosmological models. We describe the methods used to create these catalogues for the eBOSS DR16 Luminous Red Galaxy (LRG) and Quasar samples. The quasar catalogue contains 343708 redshifts with 0.8 < z < 2.2 over 4808 deg 2.

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SDSS SkyServer DR16


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8 hours ago This is a base table containing spectroscopic information and the results of the FIREFLY fits on the DR16 speclite spectra observed by SDSS (run2d=26) and BOSS, eBOSS (run2d=v5_13_0). This run used the Chabrier stellar initial mass function, the MILES and ELODIE libraries.

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Anomalies in the Counts of Low Redshift Quasars


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2 hours ago The commonly held view by astronomers and cosmologists is that redshift indicates distance for both galaxies and quasars. However, data from over 750,000 quasars, and specifically about 9500 with high accuracy measurements in the redshift range 0.05 to 0.25, contained in the Sloan Digital Sky Survey (SDSS) data release DR16 indicates several anomalies that might indicate that many quasars do

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Graziano Rossi's research works Sejong University, Seoul


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7 hours ago Graziano Rossi's 139 research works with 14,012 citations and 6,081 reads, including: The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: The Damped Lyman-$\\alpha$ systems Catalog

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Sdss.org Coupons


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9 hours ago (52 years ago) In the tradition of previous SDSS data releases, DR16 is accompanied by a quasar catalog. This catalog, which is the largest quasar catalog to date, contains data for 750,414 quasars, of which 225,082 are new. Content in the catalog is explained in detail in Lyke et al. (2020), but salient algorithms are summarized below.

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On the discovery of stars, quasars, and galaxies in the


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1 hours ago ABSTRACT This paper provides a catalogue of stars, quasars, and galaxies for the Southern Photometric Local Universe Survey Data Release 2 (S-PLUS DR2) in the Stripe 82 region. We show that a 12-band filter system (5 Sloan-like and 7 narrow …

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Astro Data Lab Query


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9 hours ago ls_dr3.dr3_dr12q Tractored survey photometry that is row-by-row-matched to the SDSS DR12 visually inspected quasar catalog (Paris et al. 2016) such that the photometric parameters in row of survey-dr3-DR12Q.fits matches the spectroscopic parameters in row of DR12Q.fits.

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Baryon acoustic oscillations from the complete SDSSIII Ly


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1 hours ago THINK OUTSIDE THE COLOR BOX: PROBABILISTIC TARGET SELECTION AND THE SDSS - XDQSO QUASAR TARGETING CATALOG journal, February 2011. Bovy, Jo; Hennawi, Joseph F.; Hogg, David W. The Astrophysical Journal, Vol. 729, Issue 2; DOI: 10.1088/0004-637X/729/2/141

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SPIDERSROS SDSSIV/SPIDERS ROSATBased XRay Point


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Just Now Overview. This catalog aims to provide a detailed description of the SPectroscopic IDentification of ERosita Sources (SPIDERS) survey, an SDSS-IV program aimed at obtaining spectroscopic classification and redshift measurements for complete samples of sufficiently bright X-ray sources. The authors describe the SPIDERS X-Ray Point Source

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The Completed SDSSIV extended Baryon Oscillation


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2 hours ago Mock quasar spectra were used to estimate DLA detection efficiency and the purity of the resulting catalog. Restricting the quasar sample to bright forests, i.e. those with mean forest fluxes $\meanflux>2\times\fluxunit$, the completeness and purity are greater than 90\% for DLAs with column densities in the range $20.1\leq \lognhi \leq 22$.

Author: Solène Chabanier, Thomas Etourneau, Jean-Marc Le Goff, James Rich, Julianna Stermer, Bela Abolfathi,...
Publish Year: 2021

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Testing general relativity on cosmological scales at


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7 hours ago ABSTRACT. We test general relativity (GR) at the effective redshift $\\bar{z} \\sim 1.5$ by estimating the statistic EG, a probe of gravity, on cosmological scale

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Frequently Asked Questions

How many quasars are in the dr16q catalog?

DR16Q contains >480,000 quasars in the first redshift range and >239,000 quasars for the Lyα forest measurements. To ensure greater completeness and purity, a subsample of spectra were selected for visual inspection and confirmation/correction of their classification and redshifts. This is summarized below.

What kind of spectra are used in Quasar catalog?

For instance, the eBOSS quasar large-scale structure catalog is produced primarily from redshifts of spectra observed during SDSS-IV, but also includes redshifts determined from SDSS I/II/III spectra (which are often referred to as "legacy" observations).

Is there a catalog of all quasars in the universe?

A catalog of quasars, DR16Q_v4.fits, was generated from the superset catalog and contains additional data such as absolute i -band magnitudes and multi-wavelength survey data cross-matched from GALEX, UKIDSS, WISE (W1 and W2), FIRST, 2MASS, 2RXS, XMM-Newton, and Gaia. This quasar-only catalog contains ~750,000 quasars.

When does the milliquas million quasars catalog come out?

This table contains the Million Quasars (MILLIQUAS) Catalog, Version 7.2 (2 May 2021). It is a compendium of 829,666 type-I QSOs and AGN, largely complete from the literature to 30 April 2021, including the SDSS-DR16Q and VLASS radio catalogs.

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