A direct measurement of the linear bias of mid-infrared-selected quasars
  at z~1 using cosmic microwave background lensing
  We measure the cross-power spectrum of the projected mass density as traced
by the convergence of the cosmic microwave background lensing field from the
South Pole Telescope (SPT) and a sample of Type 1 and 2 (unobscured and
obscured) quasars at z~1 selected with the Wide-field Infrared Survey Explorer,
over 2500 deg^2. The cross-power spectrum is detected at ~7-sigma, and we
measure a linear bias b=1.67+/-0.24, consistent with clustering analyses. Using
an independent lensing map, derived from Planck observations, to measure the
cross-spectrum, we find excellent agreement with the SPT analysis. The bias of
the combined sample of Type 1 and 2 quasars determined in this work is similar
to that previously determined for Type 1 quasars alone; we conclude that that
obscured and unobscured quasars must trace the matter field in a similar way.
This result has implications for our understanding of quasar unification and
evolution schemes.
