Statistics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5446i&link_type=abstract
HST Proposal ID #5446
Statistics
Hst Proposal Id #5446 Galaxies &Amp, Clusters Nuclei/Cores
Scientific paper
Striking results have been obtained from HST images of the cores of nearby galaxies, such as NGC 1068, NGC 1275, NGC 7457, M31, M32 and M87. The near diffraction-limited HST PSF is uniquely suited to identifying compact structures. So far, HST observations of nuclei have been largely of elliptical galaxies, and a few of the nearest early-type spiral galaxies. The nuclei of spiral and S0 galaxies are likely to prove as interesting as those of the elliptical sample (e.g., the M51 nucleus with its X-shaped dust lanes). We propose a SNAPSHOT PC imaging survey of a subset (~100) of a nearby redshift- and magnitude-limited sample of 200 disk galaxies (spiral plus E/S0) to characterize the nuclei of galaxies over a broad range of Hubble types and luminosities (to L_star-2 mag), within a variety of environments (field, Virgo and Fornax). These data will provide invaluable statistics on the presence of nuclear cusps, stellar condensations, inner stellar disks and dust lanes in disk galaxies. The properties derived for nearby "normal" galactic nuclei will also provide a reference set for studies of rarer objects, such as AGNs. Furthermore, the archival database of such observations will be a resource for more detailed studies of galactic nuclei in later HST cycles. This program is the continuation of a Cycle 3 Snapshot proposal to ensure that a statistically useful sample is obtained. We request that this program be carried out in GYRO MODE to utilize small observing windows and thus maximize the sample size.
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