  We report on deep XMM-Newton and NuSTAR observations of the high redshift,
z=2.94, extremely red quasar (ERQ), SDSS J165202.60+172852.4, with known
galactic ionized outflows detected via spatially-resolved [OIII] emission
lines. X-ray observations allow us to directly probe the accretion disk
luminosity and the geometry and scale of the circumnuclear obscuration. We fit
the spectra from the XMM-Newton/EPIC and NuSTAR detectors with a physically
motivated torus model and constrain the source to exhibit a near Compton-thick
column density of $N_H=(1.02^{+0.76}_{-0.41})\times10^{24}\textrm{ cm}^{-2}$, a
near edge-on geometry with the line-of-sight inclination angle of
$\theta_i=85^{\circ}$, and a scattering fraction of $f_{sc}\sim 3$ %. The
absorption-corrected, intrinsic 2-10 keV X-ray luminosity of
$L_{\textrm{2-10}}=(1.4^{+1}_{-1}) \times10^{45} \textrm{ erg s}^{-1}$ reveals
a powerful quasar that is not intrinsically X-ray weak, consistent with
observed trends in other ERQs. We also estimate the physical properties of the
obscuration, although highly uncertain: the warm ionized scattering density of
$n_e \sim 7.5\times(10^2-10^3)\textrm{ cm}^{-3}$ and the obscuration mass of
$M_{obsc} \sim 1.7\times(10^4-10^6) M_{\odot}$. As previously suggested with
shallower X-ray observations, optical and infrared selection of ERQ has proved
effective in finding obscured quasars with powerful outflow signatures. Our
observations provide an in-depth view into the X-ray properties of ERQs and
support the conclusions of severely photon-limited studies of obscured quasar
populations at high redshifts.
