CONFIRMATION OF FAINT DWARF GALAXIES IN THE M81 GROUP

被引：155
作者：
Chiboucas, Kristin [1 ]
Jacobs, Bradley A. [2 ]
Tully, R. Brent [2 ]
Karachentsev, Igor D. [3 ]
机构：
[1] Gemini Observ, Hilo, HI 96720 USA
[2] Univ Hawaii, Astron Inst, Honolulu, HI 96821 USA
[3] Russian Acad Sci, SAO, Nizhnii Arkhyz 369167, Karachai Cherke, Russia
来源：
ASTRONOMICAL JOURNAL | 2013年 / 146卷 / 05期
关键词：
galaxies: dwarf; galaxies: fundamental parameters; galaxies: groups: individual (M81); galaxies: luminosity function; mass function; galaxies: photometry; GIANT BRANCH STARS; MILKY-WAY SATELLITE; DARK-MATTER; LUMINOSITY FUNCTION; FORMATION HISTORY; GLOBULAR-CLUSTER; ATOMIC-HYDROGEN; EVOLUTION; ANDROMEDA; ISOCHRONES;
D O I：
10.1088/0004-6256/146/5/126
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 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 MilkyWay 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 similar to 100 pc and total magnitude estimates M-r = - 6.8 and M-I = - 9.1.
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页数：34
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