One-kpc Expanding Cylinder of HI-Gas around the Galactic Center
  We report the discovery of an expanding cylinder of HI gas of radius 1 kpc
and vertical extent 800 pc by analyzing the 21-cm line survey data from the
literature. The cylinder is expanding at 150 km s$^{-1}$ and rotating at 100 km
s$^{-1}$, and is interpreted as due to a high-velocity conical wind at $\sim
180$ km s$^{-1}$ from the Galactic Center. The total mass of the cylinder is
estimated to be $\sim 8.5\times 10^5 M_\odot$ and kinetic energy $\sim 3\times
10^{53}$ ergs.
