Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9068b&link_type=abstract
HST Proposal ID #9068
Physics
Hst Proposal Id #9068 Galaxies
Scientific paper
It is now commonly accepted that almost every galaxy should host in its center a supermassive black hole {BH}. Supermassive BH's may have played a major role in galaxy evolution as the recently found correlation between the black- hole mass and the bulge stellar velocity dispersion seems to witness. However it should be kept in mind that the current demography of supermassive BH's suffers of important biases, related to the limited sampling over the different basic properties of their host galaxies. In particular it is evident that the number of BH mass estimates in spiral galaxies is strongly underrepresented. Moreover up to now only two spiral galaxies have very accurate BH mass measurments. Therefore we propose new STIS spectroscopic observations to map the ionized gas velocity field of 3 early-type disk galaxies, for which we will be able to derive high precision BH mass measurements. Indeed the sample galaxies have been selected by means of ground-based high resolution spectroscopy among 37 observed objects, since we recognize in their central regions the clear presence of a circumnuclear Keplerian disk of ionized disk suitable for dynamical modelling.
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