We present the discovery of the highest velocity C iv broad absorption line to date in the z =2.47 quasar SDSS J023011.28+005913.6 , hereafter J0230 .
In comparing the public DR7 and DR9 spectra of J0230 , we discovered an emerging broad absorption trough outflowing at \sim 60,000 km s ^ { -1 } , which we refer to as trough A .
In pursuing follow up observations of trough A , we discovered a second emergent C iv broad absorption trough outflowing at \sim 40,000 km s ^ { -1 } , namely trough B .
In total , we collected seven spectral epochs of J0230 that demonstrate emergent and rapidly ( \sim 10 days in the rest-frame ) varying broad absorption .
We investigate two possible scenarios that could cause these rapid changes : bulk motion and ionization variability .
Given our multi-epoch data , we were able to rule out some simple models of bulk motion , but have proposed two more realistic models to explain the variability of both troughs .
Trough A is likely an augmented ‘ crossing disk ’ scenario with the absorber moving at 10 , 000 < v~ { } ( \textrm { km s$ { } ^ { -1 } $ } ) < 18 , 000 .
Trough B can be explained by a flow-tube feature travelling across the emitting region at 8 , 000 < v~ { } ( \textrm { km s$ { } ^ { -1 } $ } ) < 56 , 000 .
If ionization variability is the cause for the changes observed , trough A ’ s absorber has n _ { e } \geq 724 { ~ { } cm } ^ { -3 } and is at r _ { equal } \geq 2.00 { ~ { } kpc } , or is at r < 2.00 { ~ { } kpc } with no constraint on the density ; trough B ’ s absorber either has n _ { e } \geq 1540 { ~ { } cm } ^ { -3 } and is at r _ { equal } \geq 1.37 { ~ { } kpc } , or is at r < 1.37 { ~ { } kpc } with no constraint on the density .