| |
 |
| Paper: |
BAL Quasars with Redshifted Troughs |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
78 |
| Authors: |
Hall, P. B.; Brandt, W. N.; Petitjean, P.; Ak, N. F.; Pâris, I.; Aubourg, E.; Anderson, S. F.; Schneider, D. P.; Bizyaev, D.; Brinkmann, J.; Myers, A. D.; Malanushenko, E.; Malanushenko, V.; Oravetz, D. J.; Ross, N. P.; Shelden, A.; Simmons, A. E.; Weaver, B. A.; York, D. G. |
| Abstract: |
We report the discovery in the Sloan Digital Sky Survey
and the Baryon Oscillation Spectroscopic Survey
of ten to twelve broad absorption line (BAL) quasars with high-ionization
troughs which include absorption redshifted relative to the quasar rest frame.
The redshifted troughs extend to velocities up to ∼9000 km s-1
and the trough widths exceed 3000 km s-1 in all but one case.
Approximately 1 in 1200 BAL quasars with blueshifted C IV absorption
also has redshifted C IV absorption.
There are several potentially viable ways to generate redshifted absorption
which may be at work simultaneously (in the same objects or in different ones).
Cases of infall or rotationally dominated outflows silhouetted
against a quasar's extended continuum source would challenge current
theoretical models of BAL quasars.
Cases of outflows from one member of an unresolved binary quasar pair
seen in absorption against the other, possibly with a contribution
from the relativistic Doppler effect
in gas moving at high velocity close to transverse to our line of sight,
would provide new sightlines which literally cross-examine BAL outflows. |
|
|
|
|
|
