Computer Science – Graphics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10240b&link_type=abstract
HST Proposal ID #10240
Computer Science
Graphics
Hst Proposal Id #10240 Galaxies
Scientific paper
Hundreds of orbits of HST time have been devoted to measurements of the masses of black holes in the centers of nearby galaxies, using the kinematics of either stars or ionized gas disks. Gas-dynamical measurements are far simpler in terms of observations and analysis, but are subject to systematic uncertainties since the gas disks may not be rotating at the local circular velocity. Cross-checks between the two methods are critically important, but to date there has not been any direct test of the two methods to determine whether they would give consistent results for the same galaxy. We propose to compare stellar-dynamical and gas-dynamical measurements of the black hole masses in two S0 galaxies, NGC 3245 and NGC 1380, that we have selected as excellent candidates for both techniques. This direct comparison will help to clarify the amount of intrinsic scatter in the black hole mass vs. stellar velocity dispersion correlation and improve our understanding of local black hole demographics. For NGC 3245 we have already performed the gas-dynamical measurement.
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