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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8601s&link_type=abstract
HST Proposal ID #8601
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Hst Proposal Id #8601 Galaxies
Scientific paper
The census of galaxies in the Local Volume of space is very incomplete, particularly at the faint end. We propose to continue our very successful 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. In the first 2 months of the cycle 8 proposal, data was obtained on 18 candidates, and 15 are within 4 Mpc based on the magnitudes of the brightest stars. We are rapidly increasing the number of confirmed galaxies within 4 Mpc. Our sample is primarily 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 125 unobserved candidates. 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 if the galaxy is within 4 Mpc. Keck, VLT, and other large telescopes will be used for spectroscopic follow-up for abundances and kinematics. The survey has already discovered two possibly isolated dwarf galaxies not associated with any galaxy or group. Since the sample to be observed is chosen from an all sky sample, we will be able to determine if there is a significant number of such isolated dwarf galaxies.
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