Astrophys. J., 843, L6-L6 (2017/July-1)
d1005+68: a new faint dwarf galaxy in the M81 Group.
SMERCINA A., BELL E.F., SLATER C.T., PRICE P.A., BAILIN J. and MONACHESI A.
Abstract (from CDS):
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 MV=-7.94–0.50+0.38, with a half-light radius of rh=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.
© 2017. The American Astronomical Society. All rights reserved.
galaxies: dwarf - galaxies: individual: (d1005+68, M81 Group) - galaxies: individual: (d1005+68, M81 Group)
Table 1: [SBS2017] d1005+68 N=1.
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