Velocity shift of Mg II and Al III broad absorption lines in quasar SDSS J134444.33+315007.6

Abstract

We report, for the first time, a synchronized velocity shift of Mg II and Al III broad absorption lines (BALs) in quasar SDSS J134444.33+315007.6 (hereafter J1344+3150). We found this quasar from a sample of 134 Mg II BAL quasars with multi-epoch observations. This quasar contains three low-ionization BAL systems, the fastest of which at $\sim$$-17,000\mathrm{km}{\mathrm{s}}^{-1}$ shows a kinematic shift of $\sim$$-1101\mathrm{km}{\mathrm{s}}^{-1}$ and $\sim$$-1170\mathrm{km}{\mathrm{s}}^{-1}$ in its Mg II and Al III ions, respectively, during a rest-frame time of about 3.21 yr. Meanwhile, this quasar also shows other various variation characteristics, including an obvious weakening in its continuum, a coordinated enhancement in multiple emission lines (Mg II, C III and Al III), and a coordinated enhancement in three Al III absorption troughs. These variation characteristics convincingly indicate that the BAL outflows of J1344+3150 are under the influence from the background radiation energy. Thus, we infer that the velocity shift displayed in system A in the quasar J1344+3150 may indicate an actual line-of-sight acceleration of an outflow due to the radiation pressure from the central source.

arXiv comment4 pages, 1 figure, accepted for publication in MNRAS Letters

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• The SDSS-V Black Hole Mapper Reverberation Mapping Project: CIV BAL Acceleration in the Quasar SBS 1408+544
• Transient LoBALs at high velocities: A Case of Extreme Broad Absorption Line Variability in J115636.82+085628.9