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We report a synchronized kinematic shift of CIV and SiIV broad absorptionlines (BAL) in a high-ionization, radio-loud, and X-ray bright quasarSDSS-J092345+512710 (at $z_{em} \sim 2.1627$). This quasar shows two broadabsorption components (blue component at $v \sim 14,000\ km\ s^{-1}$, and redcomponent at $v \sim 4,000\ km\ s^{-1}$ with respect to the quasars systemicredshift). The absorption profiles of CIV and SiIV BAL of the blue componentshow 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-likesignature in the red component. This is consistent with dramatic variabilitiesusually seen at high velocities. During our monitoring period the quasar hasshown no strong continuum variability. We suggest the observed variabilitycould be related to the time dependent changes in disk wind parameters likelaunching radius, initial flow velocity or mass outflow rate.

Deceleration of CIV and SiIV broad absorption lines in X-ray bright quasar SDSS-J092345+512710