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| Paper: |
Testing Disk-Wind Models with Quasar CIV 1549Å Associated Absorption Lines |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
226 |
| Authors: |
Vestergaard, M. |
| Abstract: |
Narrow associated C IV 1549Å absorption lines (NALs) with a
rest equivalent width EW ≥3 Å detected in z ∼ 2
radio-loud and radio-quiet quasars, (a) exhibit evidence of an origin
in radiatively accelerated gas, and (b) may be closely related to broad
absorption line (BAL) outflows. These NALs and the few BALs detected
in this quasar sample obey key predictions of models of radiatively
driven disk-winds in which (1) the local disk luminosity launches the
wind, (2) the central UV radiation drives it outwards, and (3) the
wind acceleration (i.e., terminal velocity) depends on the strength of
the X-ray to UV emission ratio, i.e., αOX. The latter
means that quasars with flat αOX (like radio-louds)
should not have strong, high-velocity (BAL-like) outflows. These
results are of interest not only to studies of disk wind scenarios and
quasar structure, but also to studies of quasar feedback: NALs that
originate in powerful outflows are potential probes of quasar feedback
on its environment, since NALs are more commonly occuring than BALs,
irrespective of quasar radio properties (Vestergaard 2003). |
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