Stellar Kinematics Near the Nucleus of M32: the Central Black Hole Confirmed?

Details Stellar Kinematics Near the Nucleus of M32: the Central Black Hole Confirmed? Stellar Kinematics Near the Nucleus of M32: the Central Black Hole Confirmed?

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5847v&link_type=abstract

HST Proposal ID #5847

Computer Science

Hst Proposal Id #5847 Agn

Scientific paper

Ground-based stellar kinematical data and HST photometry suggest that M32 might have a massive central black hole. In several recent papers we presented a comprehensive study of the dynamical structure of M32. We obtained high spatial resolution ground-based kinematical data, and determined the deviations of the stellar line-of-sight velocity distributions from Gaussians. We constructed detailed axisymmetric models and found a model with a 1.8 x 10^6 solar mass black hole that fits the HST photometry and all ground-based kinematical data. This makes M32 one of the best cases for a central black hole in a quiescent galaxy. We will obtain HST absorption-line spectra of M32, using the FOS/RD with the G570H grating and various apertures at 6 different positions near the nucleus. The target will be acquired with a five-stage peakup into the 0.1-PAIR aperture. With this aperture our black hole model predicts a stellar velocity dispersion of 116 km/s on the nucleus, and a stellar rotation velocity of 42 km/s at 0.086" along the major axis. Detailed simulations show that these effects are measurable with the FOS, in spite of the relatively large instrumental dispersion and wavelength calibration uncertainties. Wavelength calibration spectra will be taken at the end of each orbit. All observations will be done in one visit of nine orbits. One pointing verification FOS/IMAGE will be obtained at the end of the visit.

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