http://arxiv.org/abs/1811.12483
We report the discovery of disappearance of Mg ii, Al iii, C iv, and Si iv broad absorption lines (BALs) at the same velocity, accompanied by a new Civ BAL emerging at a higher velocity, in the quasar J0827+4252 at z = 2.038. This is the first report of BAL disappearance (i) over Mg ii, Al iii, C iv, and Si iv ions and (ii) in a weak emission-line quasar (WLQ). The discovery is based on four spectra from the SDSS and one follow-up spectrum from HET/LRS2. The simultaneous Civ BAL disappearance and emergence at different velocities, together with no variations in the CRTS light curve, indicate that ionization changes in the absorbing material are unlikely to cause the observed BAL variability. Our analyses reveal that transverse motion is the most likely dominant driver of the BAL disappearance/emergence. Given the presence of relativistic BAL outflows in this WLQ and large C iv emission-line blueshifts that are likely associated with bulk outflows among WLQs, J0827+4252 provides a notable opportunity to study extreme quasar winds.
W. Yi, M. Vivek, W. Brand, et. al.
Mon, 3 Dec 18
26/63
Comments: Submitted to ApJL. 6 pages, 2 figures
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