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Date and Time of the Query: 2019-05-19 T06:42:56 PDT
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For refcode 2013AJ....146..126C:
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2013AJ....146..126C Confirmation of Faint Dwarf Galaxies in the M81 Group Chiboucas, Kristin; Jacobs, Bradley A.; Tully, R. Brent; Karachentsev, Igor D. Abstract. We have followed up on the results of a 65 deg^2^ CFHT/MegaCam imaging survey of the nearby M81 Group searching for faint and ultra-faint dwarf galaxies. The original survey turned up 22 faint candidate dwarf members. Based on two-color HST ACS/WFC and WFPC2 photometry, we now confirm 14 of these as dwarf galaxy members of the group. Distances and stellar population characteristics are discussed for each. To a completeness limit of M_{r^{'}_} = -10, we find a galaxy luminosity function slope of --1.27 +/- 0.04 for the M81 Group. In this region, there are now 36 M81 Group members known, including 4 blue compact dwarfs; 8 other late types including the interacting giants M81, NGC 3077, and M82; 19 early type dwarfs; and at least 5 potential tidal dwarf galaxies. We find that the dSph galaxies in M81 appear to lie in a flattened distribution, similar to that found for the Milky Way and M31. One of the newly discovered dSph galaxies has properties similar to the ultra-faint dwarfs being found in the Local Group with a size R_e_ ~ 100 pc and total magnitude estimates M_{r^{'}_} = -6.8 and M_I_ ~ --9.1. Key words: galaxies: dwarf, galaxies: fundamental parameters, galaxies: groups: individual: M81, galaxies: luminosity function, mass function, galaxies: photometry
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