CONFIRMATION OF FAINT DWARF GALAXIES IN THE M81 GROUP
By K. Chiboucas, B. Jacobs, R. B. Tully, I. Karachentsev. 2013
146 citations recorded by the source corpus.
We have followed up on the results of a 65 deg2 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 , 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 Re ∼ 100 pc and total magnitude estimates and MI ∼ −9.1.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/cd9503804fc778c2b53835ed713a3d286d98c7b6
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In Astronomy and Astrophysics
Citations in the corpus
- FORTY-SEVEN MILKY WAY-SIZED, EXTREMELY DIFFUSE GALAXIES IN THE COMA CLUSTER (2014, background): “Dwarf spheroidals have typical sizes of a few hundred pc (e.g., McConnachie 2012; Lieder et al. 2012), and in the Local Group and other nearby groups only a few have an effective radius exceeding 1 kpc (e.g. Kim et al. 2011; McConnachie 2012; Chiboucas et al. 2013; Merritt et al. 2014).”
- Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation (2014, background): “(2013, [187]), in every case for which data exist so far, anisotropic and flattened satellite populations have been found (see Sec.”