Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4204d&link_type=abstract
American Astronomical Society Meeting 202, #42.04; Bulletin of the American Astronomical Society, Vol. 35, p.759
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Crenshaw Michael D.
Das V. D.
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