  Henize 2-10 is a dwarf galaxy experiencing positive black hole (BH) feedback
from a radio-detected low-luminosity active galactic nucleus. Previous Green
Bank Telescope (GBT) observations detected a H2O "kilomaser" in Henize 2-10,
but the low angular resolution (33") left the location and origin of the maser
ambiguous. We present new Karl G. Jansky Very Large Array observations of the
H2O maser line at 22.23508 GHz in Henize 2-10 with ~2" resolution. These
observations reveal two maser sources distinct in position and velocity. The
first maser source is spatially coincident with the known BH outflow and the
region of triggered star formation ~70 pc to the east. Combined with the broad
width of the maser (W50 ~ 66 km s-1), this confirms our hypothesis that part of
the maser detected with the GBT is produced by the impact of the BH outflow
shocking the dense molecular gas along the flow and at the interface of the
eastern star-forming region. The second maser source lies to the south-east far
from the central BH and has a narrow width (W50 ~ 8 km s-1), suggesting a
star-formation-related origin. This work has revealed the nature of the H2O
kilomaser in Henize 2-10 and illustrates the first known connection between
outflow-driven H2O masers and positive BH feedback.
