Extended stellar substructure surrounding the Bo\"otes I dwarf
  spheroidal galaxy
  We present deep stellar photometry of the Bo\"otes I dwarf spheroidal galaxy
in g and i band filters, taken with the Dark Energy Camera at Cerro Tololo in
Chile. Our analysis reveals a large, extended region of stellar substructure
surrounding the dwarf, as well as a distinct over-density encroaching on its
tidal radius. A radial profile of the Bo\"otes I stellar distribution shows a
break radius indicating the presence of extra-tidal stars. These observations
strongly suggest that Bo\"otes I is experiencing tidal disruption, although not
as extreme as that exhibited by the Hercules dwarf spheroidal. Combined with
revised velocity dispersion measurements from the literature, we see evidence
suggesting the need to review previous theoretical models of the Bo\"otes I
dwarf spheroidal galaxy.
