Dr16 Quasar Catalog


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7 hours ago Overview. This table contains the Million Quasars (MILLIQUAS) Catalog, Version 7.3 (31 October 2021). It is a compendium of 828,783 type-I QSOs and AGN, largely complete from the literature to 31 October 2021, including the SDSS-DR16Q and VLASS and RACS radio catalogs. Also included are 686,292 quasar candidates which are calculated as 60-100%

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8 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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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

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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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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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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

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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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4 hours ago The SDSS-DR16 Quasar Superset and pipeline catalogues are searched for undeclared quasars which were concealed by or confused with other objects, usually due to incomplete deblending.

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9 hours ago The Milliquas (Million Quasars) catalog version 7.3c -- quasars to 31 October 2021 including SDSS-DR16 quasars and VLASS & RACS radio data including double radio lobes. This edition totals over 1.1 million objects. Get it here. The All-Sky Portable Optical Catalog (ASP: 2017, PASA 34, 25) presents 1.16 billion optical objects in an all-sky downloadable catalog.

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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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3 hours ago final BOSS quasar catalog, DR12Q, containing 297,301 quasars. DR12Q also contained data from external catalogs in other wavelength ranges, multiple redshift estimates, and broad emission-line parameters. DR14Q (Pâris et al. 2018) was the first quasar catalog released as part of the SDSS-IV quasar program, containing 526,356 quasars.

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8 hours ago VII/289/dr16q (c) The SDSS quasar-only catalog from DR16 (DR16Q) (original column names in green) (750414 rows) VII/289/superset (c) The "superset" of all SDSS-IV/eBOSS objects targeted as quasars (original column names in green) (1440615 rows) ALL (c) indicates tables which contain celestial coordinates

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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 "N" of DR16Q_v4.fits.

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6 hours ago The SDSS-DR16 Quasar Superset and pipeline catalogues are searched for undeclared quasars that were concealed by or confused with other objects, usually due to incomplete deblending. 40 such quasars with redshifts are found and herewith presented.

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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 …

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2 hours ago This catalog contains the 542 galaxy cluster and group candidates detected in the eROSITA Final Equatorial-Depth Survey (eFEDS) presented in Liu et al. 2021. The main X-ray properties of these sources including temperature, luminosity, and flux, measured with the eROSITA data, are presented. Liu et al. A&A accepted.

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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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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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Frequently Asked Questions

How many quasars are in the dr16q catalog?

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.

What is the half million quasars catalog?

The confirmed quasars of this catalog (to Jan 2015) were published as the Half Million Quasars (HMQ) catalog: Flesch E., 2015,PASA,32,10. Note however that Milliquas uses optical sky data from ASP (2017,PASA,34,25) whereas the HMQ used optical sky data from QORG (2004,A&A,427,387) Appendix A.

What are the features of interest in the sdss iiiboss quasar catalogs?

Unlike the SDSS-III/BOSS quasar catalogs, features of interest such as broad absorption line quasars (BALs) and damped Lyα systems (DLAs) were not flagged. The small percentage of visual inspections did not constitute a large enough sample for these featured objects in comparison to a pipeline.

How many quasars did the eboss mission observe?

Over a sky area of 7500 sq. deg., the eBOSS mission planned to observe more than 500,000 confirmed quasars in the range 0.8 < z < 2.2 and observe ~120,000 quasars for Lyα forest measurements in the range z > 2.1 ( Myers et al. 2015 ). DR16Q contains >480,000 quasars in the first redshift range and >239,000 quasars for the Lyα forest measurements.

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