Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6107j&link_type=abstract
HST Proposal ID #6107
Computer Science
Hst Proposal Id #6107 Galaxies &Amp, Clusters
Scientific paper
In our previous HST WFPC1 photometric study of a complete sample of ellpitical galaxies in the Virgo cluster, we discovered that the nuclei of ellipticals fainter than M_B = - 19.5 contain small, thin, bright stellar disks with radii less than 100 pc and heights less than 10 pc. Here we propose new observations of two of these disky ellipticals (NGC 4342, and NGC 4570), with the object of estimating the galaxy central masses, and measuring the age of the disks. With the FOS G570H spectroscopy we will measure the kinematics and line strengths of the disks at 20 pc resolution. With the WFPC2 we will take images at three wavelengths (U, V, I) to investigate population differences between the disks and the host galaxies. The rotation curves of the dynamically cold disks will yield accurate, unambiguous estimates (or limits) of the central masses, allowing us to determine if average cluster ellipticals host massive black holes. The population analysis and kinematics will help determine whether the fainter galaxies are the basic ``bricks" from which more luminous galaxies are formed, or are themselves composite systems.
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