Signatures of Young Star Formation Activity Within Two Parsecs of Sgr A*
  We present radio and infrared observations indicating on-going star formation
activity inside the $\sim2-5$ pc circumnuclear ring at the Galactic center.
Collectively these measurements suggest a continued disk-based mode of on-going
star formation has taken place near Sgr A* over the last few million years.
First, VLA observations with spatial resolution 2.17$"\times0.81"$ reveal 13
water masers, several of which have multiple velocity components. The presence
of interstellar water masers suggests gas densities that are sufficient for
self-gravity to overcome the tidal shear of the 4$\times10^6$ \msol\, black
hole. Second, SED modeling of stellar sources indicate massive YSO candidates
interior to the molecular ring, supporting in-situ star formation near Sgr A*
and appear to show a distribution similar to that of the counter-rotating disks
of $\sim$100 OB stars orbiting Sgr A*. Some YSO candidates (e.g., IRS~5) have
bow shock structures suggesting that they have have gaseous disks that are
phototoevaporated and photoionized by the strong radiation field. Third, we
detect clumps of SiO (2-1) and (5-4) line emission in the ring based on CARMA
and SMA observations. The FWHM and luminosity of the SiO emission is consistent
with shocked protostellar outflows. Fourth, two linear ionized features with an
extent of $\sim0.8$ pc show blue and redshifted velocities between $+50$ and
$-40$ \kms, suggesting protostellar jet driven outflows with mass loss rates of
$\sim5\times10^{-5}$ solar mass yr$^{-1}$. Finally, we present the imprint of
radio dark clouds at 44 GHz, representing a reservoir of molecular gas that
feeds star formation activity close to Sgr A*.
