Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12162b&link_type=abstract
HST Proposal ID #12162. Cycle 18
Computer Science
Scientific paper
M87 contains the most massive black hole that has been detected dynamically in any nearby galaxy, and it provides a crucial anchor for the uppermost end of the correlations between black hole mass and host galaxy properties. However, the best current measurements of the black hole mass from stellar dynamics and from the dynamics of the circumnuclear ionized gas disk disagree by a factor of 2, and the discrepancy is significant at the 3-sigma level. Since M87 provides crucial information on the top of the M-sigma relation, it is important to determine the cause of this disagreement and to resolve this discrepancy.Our goal is to improve the gas-dynamical measurement of the central mass of M87. This work will improve on the past measurements by {a} fully mapping out the kinematic structure of the nuclear emission-line disk, and {b} carrying out comprehensive dynamical modeling, including the possible effects of pressure support or asymmetric drift, which were not considered in past measurements for M87. To accomplish this, we propose to obtain new STIS G750M spectra with the 52X0.1 slit, at five parallel and contiguous positions covering the inner portion of the nuclear disk. Our kinematic measurements and dynamical modeling will provide one of the best comparison tests between gas and stellar dynamical measurements of black hole masses, and an important new constraint on the upper end of the M-sigma relation.;
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