Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9830b&link_type=abstract
HST Proposal ID #9830
Other
Hst Proposal Id #9830 Galaxies
Scientific paper
An August 2002 detection at 21-cm of a previously undetected low surface brightness galaxy yielded a radial velocity of -360 km/s. As the galaxy is located in the opposite part of the sky as the Virgo cluster, its seems quite likely that this velocity places it squarely in the Local Group {LG}. The characteristics of this galaxy, if its at a distance of 1-2 Mpc, are such that it easily could have escaped detection from previous searches. Its optical surface brightness is low and its integrated blue magnitude would lie in the range -6.5 to -8.0. The total H I mass is less than 3 x 10^5 solar masses. The H I profile is relatively low S/N and distorted, with a signal that is spread out over about 80 km/s. much larger than the internal velocity dispersion of the galaxy. This is likely the result of an interaction {most probably with M31}. With the efficiency of the ACS, we can easily detect the TRGB population in this object using V and I observations in 2 orbits. The goal here is to provide confirming evidence that this object is indeed a member of the LG by obtaining its distance via the now well calibrtated TRGB method using V-I as the filter system. If indeed in the LG {which seems likely} it would also represent a new kind of dwarf galaxy as its considerably more compact than other LG dwarfs of similar absolute magnitude.
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