The X-Rays wind connection in PG 2112+059
  We study the connection between the X-ray and UV properties of the broad
absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by
comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three
different epochs. We observe a correlation whereby an increase in the
equivalent-widths (EWs) of the BALs is accompanied by a redder UV spectrum. The
growth in the BALs EWs is also accompanied by a significant dimming in soft
X-ray emission (<2 keV), consistent with increased absorption. Variations in
the hard X-ray emission (>2 keV) are only accompanied by minor spectral
variations of the UV-BALs and do not show significant changes in the EW of
BALs. These trends suggest a wind-shield scenario where the outflow inclination
with respect to the line of sight is decreasing and/or the wind mass is
increasing. These changes elevate the covering fraction and/or column densities
of the BALs and are likely accompanied by a nearly contemporaneous increase in
the column density of the shield.
