%0 Generic %1 smercina2017d100568 %A Smercina, Adam %A Bell, Eric F. %A Slater, Colin T. %A Price, Paul A. %A Bailin, Jeremy %A Monachesi, Antonela %D 2017 %K dwarf group m81 %T d1005+68: A New Faint Dwarf Galaxy in the M81 Group %U http://arxiv.org/abs/1706.07039 %X 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 $M_V = -7.94_-0.50^+0.38$, 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.

@misc{smercina2017d100568, abstract = {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 $M_{V} = -7.94_{-0.50}^{+0.38}$, 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] $= -1.90 \pm 0.24$. 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.}, added-at = {2017-06-22T09:33:44.000+0200}, author = {Smercina, Adam and Bell, Eric F. and Slater, Colin T. and Price, Paul A. and Bailin, Jeremy and Monachesi, Antonela}, biburl = {https://www.bibsonomy.org/bibtex/298530dd6d63cd8685d0537617f8ab008/miki}, description = {[1706.07039] d1005+68: A New Faint Dwarf Galaxy in the M81 Group}, interhash = {ecb242fae386fb8ecead5363f4de561f}, intrahash = {98530dd6d63cd8685d0537617f8ab008}, keywords = {dwarf group m81}, note = {cite arxiv:1706.07039Comment: 7 pages, 4 figures, 1 table}, timestamp = {2017-06-22T09:33:44.000+0200}, title = {d1005+68: A New Faint Dwarf Galaxy in the M81 Group}, url = {http://arxiv.org/abs/1706.07039}, year = 2017 }