Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 843, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa78fa
Keywords
galaxies: dwarf; galaxies: individual (d1005+68, M81 Group)
Categories
Funding
- National Science Foundation [DGE 1256260, AST-1238877]
- National Aeronautics and Space Administration [NNX08AR22G]
Ask authors/readers for more resources
We present the discovery of d1005+68, a new faint dwarf galaxy in the M81 Group, using observations taken with the Subaru Hyper Suprime-Cam. d1005+68's color-magnitude diagram is consistent with a distance of 3.98(-0.43)(+0.39) Mpc, establishing group membership. We derive an absolute V-band magnitude, from stellar isochrone fitting, of M-V = -7.94(-0.50)(+.38), with a half-light radius of r(h) = 188(-41)(+39) pc. These place d1005+68 within the radius-luminosity locus of Local Group and M81 satellites and among the faintest confirmed satellites outside the Local Group. Assuming an age of 12 Gyr, d1005+68's red giant branch is best fit by an isochrone of [Fe/H] = -1.90 +/- 0.24. It has a projected separation from nearby M81 satellite BK5N of only 5 kpc. As this is well within BK5N's virial radius, we speculate that d1005+68 may be a satellite of BK5N. If confirmed, this would make d1005+68 one of the first detected satellites-of-a-satellite.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available