ALMA Detection of Bipolar Outflows: Evidence for Low Mass Star Formation
  within 1pc of Sgr A*
  We report the discovery of 11 bipolar outflows within a projected distance of
1pc from Sgr A* based on deep ALMA observations of $^{13}$CO, H30$\alpha$ and
SiO (5-4) lines with sub-arcsecond and $\sim1.3$ km/s, resolutions. These
unambiguous signatures of young protostars manifest as approaching and receding
lobes of dense gas swept up by the jets created during the formation and early
evolution of stars. The lobe masses and momentum transfer rates are consistent
with young protostellar outflows found throughout the disk of the Galaxy. The
mean dynamical age of the outflow population is estimated to be
$6.5^{+8.1}_{-3.6}\times10^3$ years. The rate of star formation is
$\sim5\times10^{-4}$\msol\,yr$^{-1}$ assuming a mean stellar mass of $\sim0.3$
\msol. This discovery provides evidence that star formation is taking place
within clouds surprisingly close to Sgr A*, perhaps due to events that compress
the host cloud, creating condensations with sufficient self-gravity to resist
tidal disruption by Sgr A*. Low-mass star formation over the past few billion
years at this level would contribute significantly to the stellar mass budget
in the central few pc of the Galaxy. The presence of many dense clumps of
molecular material within 1pc of Sgr A* suggests that star formation could take
place in the immediate vicinity of supermassive black holes in the nuclei of
external galaxies
