Spectra to Constrain the Dynamics of Clouds in the Narrow-Line Region of NGC 1068

Details Spectra to Constrain the Dynamics of Clouds in the Narrow-Line Region of NGC 1068 Spectra to Constrain the Dynamics of Clouds in the Narrow-Line Region of NGC 1068

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7353c&link_type=abstract

HST Proposal ID #7353

Other

Hst Proposal Id #7353 Agn/Quasars

Scientific paper

These STIS spectra will constrain the small-scale geometry and dynamics of high-velocity, circumnuclear gas in the Seyfert galaxy NGC 1068. STIS medium resolution gratings will be used to map emission-line profiles in clouds from two species sensitive to different excitation and dust optical depth. These maps will be combined with extensive ``datacubes" of optical line profiles that we have obtained from the ground with Fabry- Perot and integral field imaging spectrometers. We have used these datacubes to establish a first-order kinematic model. The model constrains the outflow velocity and geometric orientation of the filaments, allowing our proposed spectra to be sensitive to local conditions and dynamics. In particular, models of central-source and shock photoionization {the latter from bow-shock interactions between interstellar clouds and relativistic wind or jet plasma} predict significant differences in the relative fluxes and profiles of UV resonance and semi-forbidden lines. We will use the low- resolution STIS gratings to establish UV line fluxes to compare with the predictions of these diagnostic models. The results will provide important constraints on more distant quasars whose emission-line regions are too compact for HST and other high-resolution telescopes to resolve, and which therefore possess far fewer dynamical constraints from other wavebands.

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