Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9859e&link_type=abstract
HST Proposal ID #9859
Computer Science
Hst Proposal Id #9859 Galaxies
Scientific paper
The mass of the supermassive black hole {BH} in the double nucleus of the nearby galaxy M31 will be determined to 30% accuracy. This will be accomplished using the spectrum of the UV peak, a 0.4 pc stellar cluster of stars associated with the BH, and the line of sight velocity distributions {LOSVDs} of the underlying nucleus. HST/STIS, in its G430L configuration, is the only instrument that can obtain a high spatial resolution spectrum in the blue spectral domain where this UV cluster significantly contributes. The expected velocity dispersion of this cluster is greater than 550 km/s and will be measured with an accuracy of 10% with the previously detected Balmer lines. The high signal-to-noise attained simultaneously in the 4500-5500 Angstrom region will be exploited to retrieve the full LOSVDs of the nuclear disk in the region where the dispersion is high. The LOSVDs will be used in turn to constrain dynamical models of eccentric {m=1} Keplerian modes, developed to account for the asymmetries seen in M31's nucleus. This proposal combines the efforts of four groups that are leading the effort to understand the role of such m=1 modes in galactic nuclei, especially via its most nearby example in the nucleus of M31.
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