Spectral Properties of Quasars from Sloan Digital Sky Survey Data Release 14: The Catalog

We present measurements of the spectral properties for a total of 526,265 quasars, out of which 63% have a continuum signal-to-noise ratio > 3 pixel^-1, selected from the fourteenth data release of the Sloan Digital Sky Survey (SDSS-DR14) quasar catalog. We performed a careful and homogeneous analysis of the SDSS spectra of these sources to estimate the continuum and line properties of several emission lines such as Hα, Hβ, Hγ, Mg II, C III], C IV, and Lyα. From the derived emission line parameters, we estimated single-epoch virial black hole masses (M_BH) for the sample using Hβ, Mg II, and C IV emission lines. The sample covers a wide range in bolometric luminosity ( $\mathrm{log}{L}_{\mathrm{bol}};$ erg s^-1) between 44.4 and 47.3 and $\mathrm{log}{M}_{\mathrm{BH}}$ between 7.1 and 9.9 M_⊙. Using the ratio of L_bol to the Eddington luminosity as a measure of the accretion rate, the logarithm of the accretion rate is found to be in the range between -2.06 and 0.43. We performed several correlation analyses between different emission line parameters and found them to match the correlation known earlier using smaller samples. We note that strong Fe II sources with a large Balmer line width and highly accreting sources with large M_BH are rare in our sample. We make an extended and complete catalog available online that contains various spectral properties of 526,265 quasars derived in this work along with other properties culled from the SDSS-DR14 quasar catalog.