Gas Cloud Kinematics near the Nucleus of NGC 4151

Details Gas Cloud Kinematics near the Nucleus of NGC 4151 Gas Cloud Kinematics near the Nucleus of NGC 4151

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492l.115h&link_type=abstract

Astrophysical Journal Letters v.492, p.L115

Astronomy and Astrophysics

Astronomy

59

Galaxies: Seyfert, Galaxies: Kinematics And Dynamics

Scientific paper

We report early observations with Space Telescope Imaging Spectrometer (STIS) of the nuclear region of NGC 4151. Direct images in [O II] and [O III] and slitless medium-dispersion spectral images of the H beta to [O III] region were obtained. A slitless UV spectral image was taken of the C IV 1550 A region. We present radial velocities and line ratios of ~40 clouds resolved in the narrow-line region (NLR). The kinematics suggest outflow within a biconical region about the nucleus, centered on the radio axis and viewed near the edge of the cones. A few high-velocity clouds are seen that do not fit this simple picture. Line ratios indicate that the NLR gas is photoionized by the central continuum source and that there may be a density gradient in the NLR. These observations are being followed by an extensive STIS program on NGC 4151.

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