Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10230g&link_type=abstract
HST Proposal ID #10230
Computer Science
Hst Proposal Id #10230 Agn/Quasars
Scientific paper
We have discovered a decreasing radial velocity in an outflowing UV absorber in NGC 3783 -- the first unambiguous detection of kinematic variability in an AGN outflow. The observed velocity shift could be due either to bulk deceleration of the outflow or a geometric effect, in which the radially projected component of velocity changes as the outflow moves across our line of sight. Several pieces of evidence support the latter interpretation. A simple geometric model of an absorber with a changing velocity vector predicts the absorption line depths will decrease sometime before mid-2005, at an increasingly rapid rate, and eventually disappear. We propose three STIS E140M observations, obtained at 4 -- 8 months intervals, to determine the underlying mechanism causing this rare phenomenon. Specifically, these observations will allow us to: 1} track the radial velocity variations, 2} follow the evolution of the covering factors, thereby mapping the geometry and transverse motion of the absorber against the background AGN light, 3} determine the ionization structure in the outflow by monitoring ionization-dependent coverage, and 4} test for changes in the ionization of the absorber using photoionization models. These results will provide a definitive test of the geometric model, and will place strong limits on alternative mechanisms. In addition, we have also been allocated two FUSE observations of NGC 3783 in the upcoming cycle. We request simultaneous observations in at least one epoch, which will place very tight constraints on the absorption/emission geometry. These results will provide crucial input needed to test dynamical models of AGN outflows.
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