Quasar properties from the Sloan Digital Sky Survey. III. The quasars obtained by the SDSS-IV. (2023)
Keywords :
Astronomy data reduction; Active galaxies; Quasars; Supermassive black holes; Catalogs
Abstract:This paper provides the compilations of properties of the quasars newly obtained by the Sloan Digital Sky Survey (SDSS) during the fourth stage (SDSS-IV). The catalog is available on the journal's website. We have measured the main properties of emission lines around CIV, MgII, H{beta}, and H{alpha} spectral regions. We estimate the quasar redshifts from our fits of narrow [OIII], broad MgII, and broad CIV emission lines and find that the best redshifts included in DR16Q are robust with respect to our measurements. Based on the broad CIV, MgII, H{beta}, and/or H{alpha} emission lines, we calculate the virial black hole mass with empirical relationships provided by previous works. Systematic biases are found among the different line-based mass
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This work is the extension of Chen+ (2019, J/ApJS/244/36) to measure
the main emission lines and continuum for the 225082 quasars newly
included in the Sloan Digital Sky Survey (SDSS) Data Release 16 of the
Quasar Catalog (DR16Q; Lyke+ 2020, VII/289) with respect to the DR14Q;
Paris+ 2018, VII/286).
The quasar spectroscopic observations of the SDSS are carried out with
a dedicated wide-field 2.5m telescope, which is located at the Apache
Point Observatory, New Mexico. The spectra of the SDSS-IV quasars were
obtained with the Baryon Oscillation Spectroscopic Survey (BOSS)
spectrographs installed on the SDSS 2.5m telescope, at resolutions of
R~1300~2500, in a wavelength range of {lambda}=3600~10400{AA}.
The DR16Q is the final data set for the SDSS-IV quasar catalog of
eBOSS, which contains 750414 quasars. The DR16Q includes 225082 new
quasars when compared to the DR14Q, whose redshifts are shown in
Figure 1.
- VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)
- V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
- VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
- J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)
- J/ApJ/708/427 : Type 2 AGNs with double-peaked [OIII] lines (Liu+, 2010)
- J/ApJ/716/866 : SDSS search for binary AGN (Smith+, 2010)
- J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
- J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
- J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)
- J/ApJS/221/32 : Narrow MgII absorption lines from SDSS-DR9Q (Chen+, 2015)
- J/ApJ/831/7 : SDSS-RM project
- J/MNRAS/462/2980 : BOSS narrow CIV absorption lines. III. (Chen+, 2016)
- J/ApJS/228/9 : Physical parameters of ~300000 SDSS-DR12 QSOs (Kozlowski, 2017)
- J/ApJS/234/16 : H{alpha} & H{beta} spectral regions of low-z QSOs (Chen+, 2018)
- J/ApJS/235/11 : Absorption features in SDSS. I. MgII abs. (Chen+, 2018)
- J/ApJS/239/23 : CIV NAL systems from SDSS-DR14 quasar spectra (Chen+, 2018)
- J/ApJS/244/36 : QSO properties from SDSS. II. The first two years (Chen+, 2019)
- J/ApJS/249/17 : SDSS QSO DR14 spectral properties (Rakshit+, 2020)
- J/ApJS/250/3 : Variable MgII NALs in SDSS DR14 (Chen+, 2020)
