TY - JOUR
T1 - Testing Disk-Wind Models with Quasar CIV 1549Å Associated Absorption Lines
T2 - AGN Winds in Charleston. Proceedings of a Conference held 14-21 October, 2011 at the College of Charleston, Charleston, South Carolina, USA. Edited by G. Chartas, F. Hamann, and K.M. Leighly.
AU - Vestergaard, Marianne
N1 - Poster
PY - 2012/8/1
Y1 - 2012/8/1
N2 - 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., aOX.
The latter means that quasars with flat aOX (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).
AB - 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., aOX.
The latter means that quasars with flat aOX (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).
M3 - Journal article
SN - 1050-3390
VL - 460
SP - 226
JO - Astronomical Society of the Pacific. Conference Proceedings
JF - Astronomical Society of the Pacific. Conference Proceedings
ER -