Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic
  Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar
  Survey
  We present spectroscopic measurements for 226 sources from the Gemini Near
Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS). Being the largest
uniform, homogeneous survey of its kind, it represents a flux-limited sample
($m_{i}$ ${\lesssim}$ 19.0 mag, $H$ ${\lesssim}$ 16.5 mag) of Sloan Digital Sky
Survey (SDSS) quasars at 1.5 ${\lesssim}$ $z$ ${\lesssim}$ 3.5 with a
monochromatic luminosity (${\lambda}L_{\lambda}$) at 5100 ${\unicode{xC5}}$ in
the range of $10^{44} - 10^{46}$ erg $\rm{s}^{-1}$. A combination of the GNIRS
and SDSS spectra covers principal quasar diagnostic features, chiefly the C IV
${\lambda}$1549, Mg II ${\lambda}{\lambda}$2798, 2803, H${\beta}$
${\lambda}$4861, and [O III] ${\lambda}{\lambda}$4959, 5007 emission lines, in
each source. The spectral inventory will be utilized primarily to develop
prescriptions for obtaining more accurate and precise redshifts, black hole
masses, and accretion rates for all quasars. Additionally, the measurements
will facilitate an understanding of the dependence of rest-frame
ultraviolet-optical spectral properties of quasars on redshift, luminosity, and
Eddington ratio, and test whether the physical properties of the quasar central
engine evolve over cosmic time.
