Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8639w&link_type=abstract
HST Proposal ID #8639
Computer Science
Hst Proposal Id #8639 Agn/Quasars
Scientific paper
We have recently obtained HST PC images of the ionized gas in the Circinus galaxy, a nearby {distance 4 Mpc} Seyfert 2. The images reveal that the nuclear {i.e. the inner 2^ = 40 pc} high excitation gas is ``V-shaped'' and represents the inner part of the ``ionization cone'' seen previously on much larger scales in ground-based observations. At 10 - 15^ = 190 - 280 pc from the nucleus, there is an elliptical ring of high excitation gas, which we infer to be the end of the intrinsically circular cone viewed at its known orientation. The images thus suggest that the observed emission lies along the boundary of a conical structure, a situation which has probably originated through mass entrainment of dense gas in the galaxy disk along the edges of a low density outflow. We wish to obtain long slit observations of this structure. Our goals are: 1} to confirm or reject this picture kinematically; 2} investigate how gas is entrained into the outflow from the dense ism in the galaxy disk in the inner {< 40 pc} region of the outflow at unprecedented spatial resolution for a Seyfert galaxy {our resolution of 1 pc is comparable to or smaller than the expected radius of the inner edge of the putative blocking ``torus''}; 3} distinguish between collimation of ionization photons or of gaseous outflow as the origin of the ``ionization cone''; 4} attempt to measure the mass of the nuclear black hole using a long slit spectrum of the disk HII regions.
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