The Sloan Digital Sky Survey Quasar Catalog: Fourteenth Data Release

Abstract

We present the Data Release 14 Quasar catalog (DR14Q) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV). This catalog includes all SDSS-IV/eBOSS objects that were spectroscopically targeted as quasar candidates and that are confirmed as quasars via a new automated procedure combined with a partial visual inspection of spectra, have luminosities $M_{\mathrm{i}}\left[z=2\right]<-20.5$ (in a $\Lambda$CDM cosmology with $H_0=70\mathrm{km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$, ${\Omega }_{\mathrm{M}}=0.3$, and ${\Omega }_{\mathrm{\Lambda }}=0.7$), and either display at least one emission line with a full width at half maximum (FWHM) larger than $500\mathrm{km}{\mathrm{s}}^{-1}$ or, if not, have interesting/complex absorption features. The catalog also includes previously spectroscopically-confirmed quasars from SDSS-I, II and III. The catalog contains 526,356 quasars 144,046 are new discoveries since the beginning of SDSS-IV) detected over 9,376 deg${}^2$ (2,044 deg${}^2$ having new spectroscopic data available) with robust identification and redshift measured by a combination of principal component eigenspectra. The catalog is estimated to have about 0.5% contamination. The catalog identifies 21,877 broad absorption line quasars and lists their characteristics. For each object, the catalog presents SDSS five-band CCD-based photometry with typical accuracy of 0.03 mag. The catalog also contains X-ray, ultraviolet, near-infrared, and radio emission properties of the quasars, when available, from other large-area surveys.

arXiv commentAccepted for publication in A&A. The catalog is available at https://data.sdss.org/sas/dr14/eboss/qso/DR14Q/DR14Q_v4_4.fits

References in corpus (83)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The Sloan Digital Sky Survey: Technical Summary
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• The Sloan Digital Sky Survey Photometric Camera
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• The u'g'r'i'z' Standard Star Network
• The Sixth Data Release of the Sloan Digital Sky Survey
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• The Palomar Transient Factory: System Overview, Performance and First Results
• The Multi-Object, Fiber-Fed Spectrographs for SDSS and the Baryon Oscillation Spectroscopic Survey
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• Astrometric Calibration of the Sloan Digital Sky Survey
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• A photometricity and extinction monitor at the Apache Point Observatory
• Exploring the Optical Transient Sky with the Palomar Transient Factory
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity function
• The Thirteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey MApping Nearby Galaxies at Apache Point Observatory
• Second ROSAT all-sky survey (2RXS) source catalogue
• The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release
• SDSS Data Management and Photometric Quality Assessment
• A Modified Magnitude System that Produces Well-Behaved Magnitudes, Colors, and Errors Even for Low Signal-to-Noise Ratio Measurements
• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
• The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
• Measurement of BAO correlations at $z=2.3$ with SDSS DR12 \lya-Forests
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
• Photometric Calibration of the First 1.5 Years of the Pan-STARRS1 Survey
• The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
• unWISE: unblurred coadds of the WISE imaging
• The Sloan Digital Sky Survey Monitor Telescope Pipeline
• The SDSS-III Baryon Oscillation Spectroscopic Survey: Quasar Target Selection for Data Release Nine
• Space density of optically-selected type 2 quasars
• Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales
• The Sloan Digital Sky Survey quasar catalog: ninth data release
• Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
• The Sloan Digital Sky Survey quasar catalog: tenth data release
• A strong redshift dependence of the broad absorption line quasar fraction
• Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey: 100,000 z<3 Quasars from Data Release One
• Think Outside the Color Box: Probabilistic Target Selection and the SDSS-XDQSO Quasar Targeting Catalog
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Quasar Target Selection
• The SDSS-III Baryon Oscillation Spectroscopic Survey: The Quasar Luminosity Function from Data Release Nine
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• The Sloan Digital Sky Survey Reverberation Mapping Project: Velocity Shifts of Quasar Emission Lines
• Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
• High-Redshift SDSS Quasars with Weak Emission Lines
• Clustering of intermediate redshift quasars using the final SDSS III-BOSS sample
• Broad Absorption Line Variability on Multi-Year Timescales in a Large Quasar Sample
• Quasar Broad Absorption Line Variability on Multi-Year Time Scales
• Broad Absorption Line Disappearance on Multi-Year Timescales in a Large Quasar Sample
• Photometric redshifts and quasar probabilities from a single, data-driven generative model
• A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Early Data Release
• Extremely Red Quasars in BOSS
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• Hypercalibration: A Pan-STARRS1-based recalibration of the Sloan Digital Sky Survey
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• The Extended Baryon Oscillation Spectroscopic Survey: Variability Selection and Quasar Luminosity Function
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• SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV
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• The Time-Domain Spectroscopic Survey: Target Selection for Repeat Spectroscopy
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• The Time-Domain Spectroscopic Survey: Understanding the Optically Variable Sky with SEQUELS in SDSS-III
• An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data

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• Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability
• The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars
• XXL-HSC: An updated catalogue of high-redshift ($z⩾3.5$) X-ray AGN in the XMM-XXL northern field. Constraints on the bright end of the soft logN-logS
• Spectroastrometric Reverberation Mapping of Broad-line Regions
• Redshifted broad absorption line quasars found via machine-learned spectral similarity
• High-redshift quasars at $z\ge 3$: radio variability and MPS/GPS candidates
• Black hole virial masses from single-epoch photometry: the miniJPAS test case
• Identification confusion and blending concealment in the SDSS-DR16 Quasar catalogues -- 40 new quasars and 82 false quasars identified
• Eddington Ratios of Dust-obscured Quasars at $z\lesssim 1$: Evidence Supporting Dust-obscured Quasars as Young Quasars
• Stellar Reddening Based Extinction Maps for Cosmological Applications
• The Nature of Luminous Quasars with Very Large C IV Equivalent Widths
• The host galaxies of radio-loud quasars at z>5 with ALMA
• Discrimination of heavy elements originating from Pop III stars in z = 3 intergalactic medium
• Gravitationally Lensed Quasar SDSS J1442+4055: Redshifts of Lensing Galaxies, Time Delay, Microlensing Variability, and Intervening Metal System at z ~ 2
• Extreme Variability Quasars in Their Various States. II: Spectral Variation Revealed with Multi-epoch Spectra
• Deep Learning Prediction of Quasars Broad Ly$\alpha$ Emission Line
• Unresolved z~8 point sources and their impact on the bright end of the galaxy luminosity function
• Supersoft, luminous X-ray sources in galactic nuclei
• Improved Tomographic Binning of 3x2pt Lens Samples: Neural Network Classifiers and Optimal Bin Assignments
• VLA Snapshot Continuum Survey of FRI Quasar Candidates Selected from the LOFAR Two-Metre Sky Survey (LoTSS)
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) II. Luminosity Function
• A SysTematic seaRch fOr Dual Agns in meRgINg Galaxies (ASTRO-DARING) II: first results from long-slit spectroscopic observations
• SQUAB I: The first release of Strange QUasar candidates with ABnormal astrometric characteristics from Gaia EDR3 and SDSS
• A novel Bayesian approach for decomposing the radio emission of quasars: II. Link between quasar radio emission and black hole mass
• New Constraints on Lorentz Invariance Violation from Combined Linear and Circular Optical Polarimetry of Extragalactic Sources
• Effects of Superradiance in Active Galactic Nuclei
• How are Red and Blue Quasars Different? The Radio Properties
• High-$z$ Universe probed via Lensing by QSOs (HULQ) I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
• Quasar photometric redshifts from incomplete data using Deep Learning
• AGNet: Weighing Black Holes with Deep Learning
• A Multiwavelength Machine-learning Approach to Classifying X-ray Sources in the Fields of Unidentified 4FGL-DR4 sources
• Using Machine Learning to Find Ghostly Damped Ly$\alpha$ Systems in SDSS DR14
• FNet II: Spectral Classification of Quasars, Galaxies, Stars, and broad absorption line (BAL) Quasars
• Very Large Array imaging rules out precessing radio jets in three DES$-$SDSS-selected candidate periodic quasars
• BAL Outflows are common in Low Eddington Ratio AGN
• The Composite Spectral Energy Distribution of Quasars is Surprisingly Universal Since Cosmic Noon
• Quasars as high-redshift standard candles
• The optical luminosity function of LOFAR radio-selected quasars at $1.4\le z\le 5.0$ in the NDWFS-Boötes field
• Radio Dichotomy in Quasars with H$\beta$ FWHM greater than $15,000$ km\,s${}^{-1}$
• What is the origin of the stacked radio emission in radio-undetected quasars?: Insights from a radio-infrared image stacking analysis
• A search for cosmological anisotropy using the Lyman alpha forest from SDSS quasar spectra
• X-ray selected broad absorption line quasars in SDSS-V: BALs and non-BALs span the same range of X-ray properties
• A small radio galaxy at z=4.026
• Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly$\alpha$ emitters and IGM transmission in the COSMOS field at $z\sim 5$
• Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program
• Inferences on relations between distant supermassive black holes and their hosts complemented by the galaxy fundamental plane
• Forecasts for Broadband Intensity Mapping of the Ultraviolet-Optical Background with CASTOR and SPHEREx
• Evidence of under-developed torus and broad-line region of weak emission line quasars based on their spectral energy distribution
• The quasar luminosity function at $z\sim 5$ via deep learning and Bayesian information criterion
• Quasars Have Fewer Close Companions than Normal Galaxies
• Towards modelling Ghostly DLAs
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) III. A red quasar with extremely high equivalent widths showing powerful outflows
• The COS-Holes Survey: Connecting Galaxy Black Hole Mass with the State of the CGM
• A candidate quadruple AGN system at $z\sim 3$
• Does fractal Universe favour warm inflation: Observational support?
• Redshifts of radio sources in the Million Quasars Catalogue from machine learning
• Extragalactic transient candidates in the Second Swift-XRT Point Source catalogue
• QSO MUSEUM III: the circumgalactic medium in Ly$\alpha$ emission around 120 $z\sim 3$ quasars covering the SDSS parameter space. Witnessing the instantaneous AGN feedback on halo scales
• Constraints on VHE gamma-ray emission of Flat Spectrum Radio Quasars with the MAGIC telescopes
• Automated quasar continuum estimation using neural networks: a comparative study of deep-learning architectures
• A cosmological distance measure using radio-loud quasars
• Spectral Signatures of Quasar Ages at z~3
• Automated Measurement of Quasar Redshift with a Gaussian Process
• The viewing angle in AGN SED models, a data-driven analysis
• Environment of SDSS quasars at $z=0.4$$-$$1.0$ explored by Subaru HSC
• Deep absorption in SDSS J110511.15+530806.5
• Association of Optical, Ultraviolet and Soft X-ray excess Emissions in AGNs
• The Feasibility and Flexibility of Selecting Quasars by Variability Using Ensemble Machine Learning Algorithms
• DESI survey of S IV absorption outflows in quasars: Contribution to AGN feedback and comparison with [O III] emission outflows
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• Cosmological-Scale Lyman-alpha Forest Absorption Around Galaxies and AGN Probed with the HETDEX and SDSS Spectroscopic Data
• On the Origin of the Strong Optical Variability of Emission-line Galaxies
• Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey
• Glass-Like Random Catalogues for Two-Point Estimates on the Light Cone
• Serendipitous discovery of a physical binary quasar at z=1.76
• Low-ionization iron-rich Broad Absorption-Line Quasar SDSS J1652+2650: Physical conditions in the ejected gas from excited FeII and metastable HeI
• A machine learning approach to assessing the presence of substructure in quasar host galaxies using the Hyper Suprime-Cam Subaru Strategic Program
• A comparative study of ultraluminous infrared galaxies in the IRAS and SDSS Surveys
• ALMA High-Level Data Products: Submillimetre counterparts of SDSS quasars in the ALMA footprint
• Far-UV Fe Emission as Proxy of Eddington Ratios
• Dark Energy Black Holes with Intermediate Masses at High Redshifts: an earlier generation of Quasars and observations
• A New Member of the Fast and Furious Family: A Relativistic and Time-Variable UV Outflow in a Luminous Quasar
• The X-ray$-$UV Luminosity Relation of eROSITA Quasars
• Clustering properties of TGSS radio sources
• Addressing Dipole Tension via Clustering in $\Lambda$CDM and beyond
• A Comprehensive JWST/NIRSpec Census of Broad-line Active Galactic Nuclei: Faint, Low-mass Accretors and a Population of Little Red Dots
• Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program
• X-ray sources in the 1.75 Ms Ultra Narrow Deep Field observed by XMM-Newton
• Testing Large-Scale Structure Measurements Against Fisher Matrix Predictions
• Metal-strong Inflows at the Outer-galactic-scale of a Quasar
• Quasars physical properties study based on the medium-band photometric survey
• High-$z$ Universe probed via Lensing by QSOs (HULQ) II. Deep GMOS spectroscopy of a QSO lens candidate
• The dependence of the fraction of radio luminous quasars on redshift and its theoretical implications
• Using a Neural Network Classifier to Select Galaxies with the Most Accurate Photometric Redshifts