The Nuclei of Nearby s0 and Spiral Galaxies-I a PC Snapshot Imaging Surve Cycle 3 High

Details The Nuclei of Nearby s0 and Spiral Galaxies-I a PC Snapshot Imaging Surve Cycle 3 High The Nuclei of Nearby s0 and Spiral Galaxies-I a PC Snapshot Imaging Surve Cycle 3 High

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4644i&link_type=abstract

HST Proposal ID #4644

Statistics

Hst Proposal Id #4644 Galaxies &Amp, Clusters

Scientific paper

Striking results have been obtained from HST images of the cores of nearby galaxies, such as NGC 1068, NGC 1275, NGC 7457, M32 and M87. The diffraction- limited core of the HST PSF is uniquely suited to identifying compact structures. So far, the majority of HST observations of nuclei have been on elliptical galaxies, and on the very nearest early-type spiral galaxies. The nuclei of spiral galaxies are likely to prove as interesting as those of the elliptical sample. An excellent example of this is the PC image of M51 with its X-shaped subarcsecond dust lanes. We propose a SNAPSHOT PC imaging survey of a subset of a nearby redshift-limited sample of disk galaxies (spiral plus S0) to characterize the nuclei of galaxies over a broad range of Hubble types within a variety of environments, down to luminosities some 2 magnitudes fainter than L_star. A sample of 200 galaxies will be provided, of which we hope that at least 100 can be observed. 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 study of galactic nuclei in later HST cycles, when the improved PSF will allow more comprehensive spectroscopic and imaging studies to be carried out.

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