Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8192s&link_type=abstract
HST Proposal ID #8192
Other
Hst Proposal Id #8192 Field Stellar Populations
Scientific paper
The census of galaxies in the Local Volume of space is very incomplete, particularly at the faint end. We propose a snapshot survey to use the high spatial resolution of HST to determine whether selected galaxies are nearby on the basis of resolution into stars, and the magnitudes and colors of the brightest stars. Our sample is chosen from the survey by team members Karachentsev & Karachentseva {KK98} of some 260 nearby dwarf galaxy candidates. Our F606W & F814W snapshot survey will concentrate on the 75 candidates most likely to be within 4 Mpc. One HST orbit per galaxy results in a distance from the magnitude of the tip of the red giant branch {TRGB} and is sufficiently deep to identify the brightest stellar population. Keck, VLT, and other large telescopes will be used for spectroscopic follow-up for abundances and kinematics. As an example of the science to follow from this survey, consider the incompleteness of the dwarf galaxy census of the Local Group. Compariso ns with the composite luminosity f unction of nearby groups indicate that there may be as many as 30 faint Local Group members yet to be discovered. If only 10% of this sample turn out to be Local Group members, the luminosity function of the Local Group will no longer appear truncated.
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