The Extended Stellar Populations of Dwarf Galaxies

Details The Extended Stellar Populations of Dwarf Galaxies The Extended Stellar Populations of Dwarf Galaxies

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732801g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #328.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Diffuse, extended stellar populations encode information about the earliest stages of a galaxy's formation. Although most research has focused on the growth of the stellar halos of large disk galaxies like the Milky Way and Andromeda, extended envelopes of red giant branch stars have also been observed in dwarf galaxies. The extended stellar populations of low-mass galaxies are generally referred to as "halos,” yet little is known about their properties (e.g., extent, profile, metallicity, and age) and origin. We use resolved stellar photometry from the Advanced Camera for Surveys (ACS) Nearby Galaxy Survey Treasury (ANGST) to study the populations dwarf galaxy halos in detail. We find that extended, old stellar populations are found in dwarf galaxies throughout the Local Volume. We present measurements of the properties of these extended stellar populations, and contrast their properties with those of the younger stellar populations in dwarf galaxies.

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