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 Mi [z = 2] < −20.5 (in a Λ CDM cosmology with H0 = 70 km s−1 Mpc−1, Ω M =0.3, and Ω Λ = 0.7), and either display at least one emission line with a full width at half maximum larger than 500 km 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 9376 deg2 (2044 deg2 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. Redshifts are provided for the Mg II emission line. The catalog identifies 21 877 broad absorption line quasars and lists their characteristics. For each object, the catalog presents five-band (u, g, r, i, z) 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. The calibrated digital spectra, covering the wavelength region 3610–10 140 Å at a spectral resolution in the range 1300 < R < 2500, can be retrieved from the SDSS Science Archiver Server.
Highlights
Since the identification of the first quasar redshift by Schmidt (1963), each generation of spectroscopic surveys has enlarged the number of known quasars by roughly an order of magnitude: the Bright Quasar Survey (Schmidt & Green 1983) reached the 100 discoveries milestone, followed by the Large Bright Quasar Survey (LBQS; Hewett et al 1995) and its 1000 objects, the ∼25 000 quasars from the 2dF Quasar Redshift Survey (2QZ; Croom et al 2004), and the Sloan Digital Sky Survey (SDSS; York et al 2000) with over 100 000 new quasars (Schneider et al 2010)
This paper presents the Sloan Digital Sky Survey IV (SDSS-IV)/extended Baryon Oscillation Spectroscopic Survey (eBOSS) quasar catalog, denoted data release 14 Quasar catalog (DR14Q), that compiles all the spectroscopicallyconfirmed quasars identified in the course of any of the SDSS iterations and released as part of the SDSS Fourteenth data release (Abolfathi et al 2017)
We have presented the quasar catalog of the SDSS-IV/eBOSS survey corresponding to DR 14 of SDSS and resulting from the first 2 yr of SDSS-IV observations
Summary
Since the identification of the first quasar redshift by Schmidt (1963), each generation of spectroscopic surveys has enlarged the number of known quasars by roughly an order of magnitude: the Bright Quasar Survey (Schmidt & Green 1983) reached the 100 discoveries milestone, followed by the Large Bright Quasar Survey (LBQS; Hewett et al 1995) and its 1000 objects, the ∼25 000 quasars from the 2dF Quasar Redshift Survey (2QZ; Croom et al 2004), and the Sloan Digital Sky Survey (SDSS; York et al 2000) with over 100 000 new quasars (Schneider et al 2010). Function of the Lyman-α forest (e.g. Bautista et al 2017) and the cross-correlation of quasars and the Lyman-α forest (e.g. du Mas des Bourboux et al 2017) have provided unprecedented cosmological constraints at z ∼ 2.5 This sample was used to study the luminosity function of quasars (Ross et al 2013; Palanque-Delabrouille et al 2013), moderate-scale clustering of z ∼ 2.5 quasars (e.g. Eftekharzadeh et al 2015). The bulk of the newly discovered quasars contained in DR14Q arise from the main SDSS-IV/eBOSS quasar target selection (Myers et al 2015). The rest were observed by ancillary programs (83 430 quasars not targeted by the SDSS-IV/eBOSS main quasar survey; see Dawson et al 2013; Ahn et al 2014; Alam et al 2015), and TDSS and SPIDERS (27 547 and 1090, respectively). All magnitudes quoted here are point spread function (PSF) magnitudes (Stoughton et al 2002) and are corrected for Galactic extinction (Schlafly & Finkbeiner 2011)
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