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| Paper: |
Constraining Variable High Velocity Winds from Broad Absorption Line Quasars with Multi-Epoch Spectroscopy |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
98 |
| Authors: |
Haggard, D.; Arraki, K. S.; Green, P. J.; Aldcroft, T.; Anderson, S. F. |
| Abstract: |
Broad absorption line (BAL) quasars probe the high-velocity gas
ejected by luminous accreting black holes. BAL variability timescales
place constraints on the size, location, and dynamics of the emitting
and absorbing gas near the supermassive black hole. We present
multi-epoch spectroscopy of seventeen BAL QSOs from the Sloan Digital
Sky Survey (SDSS) using the Fred Lawrence Whipple Observatory's 1.5m
telescope's FAST Spectrograph. These objects were identified as BALs
in SDSS, observed with Chandra, and then monitored with FAST at
observed-frame cadences of 1, 3, 9, 27, and 81 days, as well as 1 and
2 years. We also monitor a set of non-BAL quasars with matched
redshift and luminosity as controls. We identify significant
variability in the BALs, particularly at the 1 and 2 year cadences,
and use its magnitude and frequency to constrain the outflows
impacting the broad absorption line region. |
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