Ultraviolet and Optical Emission-line Outflows in the Heavily Obscured
  Quasar SDSS J000610.67+121501.2: At the Scale of the Dusty Torus and Beyond
  Broad emission-line outflows of active galactic nuclei (AGNs) have been
proposed for many years but are very difficult to quantitatively study because
of the coexistence of the gravitationally-bound and outflow emission. We
present detailed analysis of a heavily reddened quasar, SDSS
J000610.67+121501.2, whose normal ultraviolet (UV) broad emission lines (BELs)
are heavily suppressed by the Dusty Torus as a natural "Coronagraph", thus the
blueshifted BELs (BBELs) can be reliably measured. The physical properties of
the emission-line outflows are derived as follows: ionization parameter $U \sim
10^{-0.5}$, column density $N_{\rm H}\sim 10^{22.0}$ cm$^{-2}$, covering
fraction of $\sim 0.1$ and upper limit density of $n_{\rm H}\sim 10^{5.8}$
cm$^{-3}$. The outflow gases are located at least 41 pc away from the central
engine, which suggests that they have expanded to the scale of the dust torus
or beyond. Besides, Lya shows a narrow symmetric component, to our surprise,
which is undetected in any other lines. After inspecting the narrow
emission-line region and the starforming region as the origin of the Lya narrow
line, we propose the end-result of outflows, diffusing gases in the larger
region, acts as the screen of Lya photons. Future high spatial resolution
spectrometry and/or spectropolarimetric observation are needed to make a final
clarification.
