Direct Age Determination of the dE Galaxies NGC 147 and NGC 185

Details Direct Age Determination of the dE Galaxies NGC 147 and NGC 185 Direct Age Determination of the dE Galaxies NGC 147 and NGC 185

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21522204g&link_type=abstract

American Astronomical Society, AAS Meeting #215, #222.04; Bulletin of the American Astronomical Society, Vol. 42, p.526

Astronomy and Astrophysics

Astronomy

Scientific paper

Dwarf elliptical (dE) galaxies account for more than 75% of objects brighter than MV < -14 in nearby galaxy clusters, yet the origin of this galaxy class remains controversial. Understanding the dE galaxy class will provide insight into the assembly of dense environments and is a necessary step toward answering general questions of dwarf galaxy formation and evolution. Deep ACS/WFC imaging for the Local Group dE NGC 147 will be presented, with approved imaging for NGC 185 scheduled for 2010. These are the only two dE galaxies in which HST can cleanly resolve stars in the main sequence turnoff region and thus directly measure their star formation histories. These observations are a unique opportunity to test formation models for an entire galaxy class.

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