STIS Kinematic Mapping of the Narrow Line Region of NGC4151

Details STIS Kinematic Mapping of the Narrow Line Region of NGC4151 STIS Kinematic Mapping of the Narrow Line Region of NGC4151

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.0701k&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #07.01; Bulletin of the American Astronomical Society, Vol. 30, p.1255

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Scientific paper

We present high spatial resolution (0.051 arcsec /pix) {HST} Space Telescope Imaging Spectrograph (STIS) slitless spectroscopy of the NGC4151 narrow emission-line region as a probe of the kinematic structure of the extended bicone emanating from the nucleus. Using slitless spectroscopy augmented with narrow band images, we have mapped the velocity field of the narrow line region (NLR). These measurements, at a second roll angle, confirm and extend our previous observations (Hutchings et al., 1998). In addition, we detect a set of clouds which have velocities well in excess of those predicted by pure gravitational motion. While these clouds lie preferentially near the radio axis or the radio emitting knots, none of these clouds are coincident with the radio emitting knots. Given the extremely high velocities of these clouds (400< mid vmid <1700 km s(-1) relative to the nuclear velocity), another physical process, such as wind driven outflow must be responsible for this kinematic motion. Flux measurements of the individual clouds are consistent with photoionization. Both [OIII] and Hβ emission-line cloud fluxes decline roughly as the inverse square of the distance within an inner 3arcsec (200 pc, Hdeg=75 km s(-1) Mpc(-1) ) radius from the nucleus. Thus the ratio [OIII]/ Hβ is relatively constant within this region. For radial distances extending to 400 pc from the nucleus, we see a slight increase, <30%, in the ratio of [OIII]/ Hβ . However, local variations are as pronounced as the the radial variations. \small Hutchings et al., 1998, ApJ, {492}, L115

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