Dwarf Galaxies at the Edge of the Local Group

Details Dwarf Galaxies at the Edge of the Local Group Dwarf Galaxies at the Edge of the Local Group

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...66a&link_type=abstract

NOAO Proposal ID #2000A-0066

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Scientific paper

Recently, van den Bergh (1999) suggested that four galaxies often discussed as Local Group members are probably members of an independent group, which he labels Antlia-Sextans. These four galaxies (Antlia, NGC 3109, Sextans A & B) exhibit similar distances and radial velocities that appear distinct from the distributions of those quantities for Local Group members. Thus, Antlia-Sextans is the nearest group of galaxies beyond the Local Group. However, there are no galaxies with M_V fainter than -11.0 in the Antlia-Sextans group. In order to find such galaxies, we have applied a digital enhancement and detection technique to 900 square degrees of the second generation sky survey (POSS-II, SERC) in Antlia-Sextans. In this proposal, we seek to obtain CCD images of the 202 candidates in order to separate contaminants from bona fide Antlia-Sextans dwarf galaxies. Our inferences about the dwarf galaxy population in Antlia-Sextans will help establish the reality of this very nearby group of galaxies and better determine its properties (luminosity function, size, range of metallicity, morphological mix, etc.).

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