AAS 195th Meeting, January 2000
Session 115. Seyferts and Other Mildly Active Galaxies
Display, Saturday, January 15, 2000, 9:20am-4:00pm, Grand Hall

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[115.04] Mass Outflow in the Narrow-Line Region of Seyfert Galaxies II. STIS Observations of NGC 1068 and NGC 4151

D.M. Crenshaw (CUA/GSFC), J.R. Ruiz, S.B. Kraemer (CUA)

We demonstrate that radial outflow dominates the kinematics of the inner narrow-line region (NLR) in the two prototypical Seyfert galaxies NGC 1068 (Seyfert 2) and NGC 4151 (Seyfert 1). By comparing kinematic models with long-slit spectra from the Space Telescope Imaging Spectrograph (STIS), we show that the velocities of the emission-line clouds can be explained by a simple biconical outflow model. In these models, the emission-line clouds are constantly accelerated out to a distance of 100 - 200 pc, and then decelerated, presumably as a result of interaction with ambient material. For NGC 1068, the axis of the biconical outflow is nearly in the plane of the sky, whereas for NGC 4151, the axis is tilted 50 degrees into our line of sight. The gravitational effects of the supermassive black hole in these regions are small.

The author(s) of this abstract have provided an email address for comments about the abstract: crenshaw@buckeye.gsfc.nasa.gov

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