Deceleration of CIV and SiIV broad absorption lines in X-ray bright
  quasar SDSS-J092345+512710
  We report a synchronized kinematic shift of CIV and SiIV broad absorption
lines (BAL) in a high-ionization, radio-loud, and X-ray bright quasar
SDSS-J092345+512710 (at $z_{em} \sim 2.1627$). This quasar shows two broad
absorption components (blue component at $v \sim 14,000\ km\ s^{-1}$, and red
component at $v \sim 4,000\ km\ s^{-1}$ with respect to the quasars systemic
redshift). The absorption profiles of CIV and SiIV BAL of the blue component
show decrease in outflow velocity with an average deceleration rate of
$-1.62_{-0.05}^{+0.04}\ cm\ s^{-2}$ and $-1.14^{+0.21}_{-0.22}\ cm\ s^{-2}$
over a rest-frame time-span of 4.15 yr. We do not see any acceleration-like
signature in the red component. This is consistent with dramatic variabilities
usually seen at high velocities. During our monitoring period the quasar has
shown no strong continuum variability. We suggest the observed variability
could be related to the time dependent changes in disk wind parameters like
launching radius, initial flow velocity or mass outflow rate.
