Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8684e&link_type=abstract
HST Proposal ID #8684
Other
Hst Proposal Id #8684 Agn/Quasars
Scientific paper
A fundamental gap that remains in our knowledge of AGNs is the origin and dynamics of the gas that produces their broad optical and ultraviolet emission lines. In most other accreting systems, emission lines are demonstrably linked either to the accretion disk or to an accretion-disk wind; these are both leading hypotheses for the origin of emission lines in AGNs as well. We can test both of these models by exploiting the extreme properties of the so-called ``double- peaked emitters.'' These very broad double-peaked emission lines have proven to be uniquely capable of testing dynamical models, and as a result several theories are no longer considered likely. The two major theories that are the subject of this proposal require HST for their evaluation because they make contrasting predictions about the differences between the Balmer-line and UV resonance-line profiles. In fact, there is good evidence that both photoionized disk atmospheres and radiatively driven winds contribute to observed emission lines in varying degrees. We have preliminary evidence that points toward luminosity as the primary factor which controls the relative importance of disk and wind. By observing a set of four more double-peaked emitters covering a wide range of luminosity, we will test the hypothesis that photoionized disk atmospheres dominate line production at low luminosity and winds dominate at high luminosity.
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