The Sloan Digital Sky Survey Quasar Catalog: Fourteenth Data Release
  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 $M_{\rm i} \left[ z=2 \right] < -20.5$ (in a
$\Lambda$CDM cosmology with $H_0 = 70 \ {\rm km \ s^{-1} \ Mpc ^{-1}}$,
$\Omega_{\rm M} = 0.3$, and $\Omega_{\rm \Lambda} = 0.7$), and either display
at least one emission line with a full width at half maximum (FWHM) larger than
$500 \ {\rm km \ s^{-1}}$ 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 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.
