The Halo Occupation Distribution of Obscured Quasars: Revisiting the
  Unification Model
  We model the projected angular two-point correlation function (2PCF) of
obscured and unobscured quasars selected using the Wide-field Infrared Survey
Explorer (WISE), at a median redshift of $z \sim 1$ using a five-parameter Halo
Occupation Distribution (HOD) parameterization, derived from a cosmological
hydrodynamic simulation by Chatterjee et al. The HOD parameterization was
previously used to model the 2PCF of optically selected quasars and X-ray
bright active galactic nuclei (AGN) at $z \sim 1$. The current work shows that
a single HOD parameterization can be used to model the population of different
kinds of AGN in dark matter halos suggesting the universality of the
relationship between AGN and their host dark matter halos. Our results show
that the median halo mass of central quasar hosts increases from optically
selected ($4.1^{+0.3}_{-0.4} \times 10^{12} \; h^{-1} \; {M_{sun}}$) and
infra-red (IR) bright unobscured populations ($6.3^{+6.2}_{-2.3} \times 10^{12}
\; h^{-1} \; {M_{sun}}$) to obscured quasars ($10.0^{+2.6}_{-3.7} \times
10^{12} \; h^{-1} \; {M_{sun}}$), signifying an increase in the degree of
clustering. The projected satellite fractions also increase from optically
bright to obscured quasars and tend to disfavor a simple `orientation only'
theory of active galactic nuclei unification. Our results also show that future
measurements of the small-scale clustering of obscured quasars can constrain
current theories of galaxy evolution where quasars evolve from an IR- bright
obscured phase to the optically bright unobscured phase.
