Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6587r&link_type=abstract
HST Proposal ID #6587
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Hst Proposal Id #6587 Galaxies &Amp, Clusters
Scientific paper
The campaign to find black holes in the centers of galaxies with HST has been highly successful. Major kinematic surveys for central BHs are expected to explode in Cycle 7, with the advent of STIS. In preparation for that, we propose to augment the HST imaging archive of elliptical galaxies. Images by themselves are not only integral to the study of central BHs, they are changing our whole concept of the centers of early-type galaxies. Adding some 28 carefully chosen ellipticals would greatly enhance the archive's flexibility and ability to address a wide variety of problems. Specific classes of galaxies that are now under-represented include massive ellipticals, field ellipticals, and disturbed ellipticals. Enlarging the archive by only ~30% would double or triple the number of objects in each of these key categories. Associated two-color imaging will provide a rich database for globular cluster programs, surface-brightness- fluctuation distances, stellar populations, and many other programs. We also propose to reimage seven power-law ellipticals that were observed in Cycles 1-2. Dithering plus the improved post-repair PSF will sharpen the resolution by a factor of 3-4 and may reveal tiny cores. This discovery would constitute an important new class of central light profile intermediate between the current cores and power-laws.
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