Deceleration of C iv and Si iv Broad Absorption Lines in X-Ray Bright Quasar SDSS-J092345+512710

Abstract

We report a synchronized kinematic shift of C iv   and Si iv   broad absorption lines (BAL) in a high-ionization, radio-loud, and X-ray bright quasar SDSS-J092345+512710 (at  ∼ 2.1627). This quasar shows two broad absorption components (blue component at v  ∼ 14,000 km s −1 , and red component at v  ∼ 4000 km s −1 with respect to the quasars systemic redshift). The absorption profiles of C iv   and Si iv   BAL of the blue component show a decrease in outflow velocity with an average deceleration rate of cm s −2 and 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.