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We present the discovery of a new dwarf galaxy, Hydra II, foundserendipitously within the data from the ongoing Survey of the MAgellanicStellar History (SMASH) conducted with the Dark Energy Camera on the Blanco 4mTelescope. The new satellite is compact (r_h = 68 +/- 11 pc) and faint (M_V =-4.8 +/- 0.3), but well within the realm of dwarf galaxies. The stellardistribution of HydraII in the color-magnitude diagram is well-described by ametal-poor ([Fe/H] = -2.2) and old (13 Gyr) isochrone and shows a distinct bluehorizontal branch, some possible red clump stars, and faint stars that aresuggestive of blue stragglers. At a heliocentric distance of 134 +/- 10 kpc,Hydra II is located in a region of the Galactic halo that models have suggestedmay host material from the leading arm of the Magellanic Stream. A comparisonwith N-body simulations hints that the new dwarf galaxy could be or could havebeen a satellite of the Magellanic Clouds.

Hydra II: a faint and compact Milky Way dwarf galaxy found in the Survey of the Magellanic Stellar History