The Dwarf Galaxy Population of the M81 Group

Details The Dwarf Galaxy Population of the M81 Group The Dwarf Galaxy Population of the M81 Group

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714707c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #147.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

In a CFHT/Megacam imaging survey of the M81 Group to search for the smallest dwarf galaxies, we identified 22 new candidate dwarf galaxies. Follow-up HST ACS and WFPC2 imaging in F814W and F606W bands was used to produce color-magnitude diagrams down to 1.5-3 mag below the tip of the red giant branch. From tip of the red giant branch distances, we establish 14 out of the 22 candidates as bona-fide group members, including 3 blue compact dwarfs, 1 likely tidal dwarf, and a dwarf spheroidal galaxy as faint as MR = -6.9. The latter is within the domain of the ultra-faint dwarf galaxies recently discovered in the Local Group. As the original survey extended out to the group second turnaround radius, and based on detection limits determined from simulations, we believe our sample of M81 group galaxy members is largely complete down to MR = -9.5. We discuss the properties of the M81 Group dwarf galaxy population.

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