AAS 195th Meeting, January 2000
Session 99. Early-type Galaxies
Oral, Friday, January 14, 2000, 2:00-3:30pm, Centennial IV

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[99.04] STIS Observations of the Centers of Elliptical Galaxies

J. Pinkney (UMich), K. Gebhardt (UCSC/Lick Observatory), D. Richstone (UMich), R. Bender (USM)

We present the results of HST STIS spectroscopy of 10 early type galaxies proposed in Cycle 7. The G750M grating was used to observe the Ca II stellar absorption lines. Three techniques were used to derive the stellar losvd (line of sight velocity distribution) from the Ca II lines. The spectra have a S/N of 25-30/Åin most cases, which results in ~5% errors on central velocity dispersion, and ~15 km s-1 errors on velocities. These errors allow precision modelling of the central black hole masses and stellar orbits. We present the profiles of velocity, velocity dispersion, and also the higher moments of the losvd (H3, H4) along the major axes of all 10 galaxies. For one galaxy, NGC 4697, we also have a STIS spectrum at 6581Åallowing a comparison of the gas kinematics (using [NII] emission) with the stellar kinematics.

We acknowledge support from HST grant GO-07388.01 and LTSA grant NAG5-8238 to D. Richstone.

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