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[42.04] Mapping the Kinematics of the Narrow-Line Region in NGC 4151

V.D. Das, D.M. Crenshaw (GSU)

Using HST'S Space Telescope Imaging Spectrograph (STIS), observations of the [OIII] emission from the narrow-line region of NGC 4151 were measured and radial velocities determined. Five orbits of HST time yielded five parallel slit configurations, at a position angle of 58 degrees with spatial resolution 0.2 arcseconds across each slit. A spectral resolving power of 10,000 with the G430M grating gave velocity measurements accurate to 30 km/s. A kinematic model was generated to match the radial velocities, for comparison to previous kinematic models of biconical radial outflow developed for low-dispersion spectra at two slit positions. The new high-resolution spectra permit the measurement of accurate velocity dispersions for each radial-velocity component. The full-width at half-maximum reaches a maximum near 1000 km/s near the nucleus, and generally decreases with increasing distance to about 100 km/s in the extended narrow-line region, at about 6 arcseconds from the nucleus.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.