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We report the discovery of an expanding cylinder of HI gas of radius 1 kpcand vertical extent 800 pc by analyzing the 21-cm line survey data from theliterature. The cylinder is expanding at 150 km s$^{-1}$ and rotating at 100 kms$^{-1}$, and is interpreted as due to a high-velocity conical wind at $\sim180$ km s$^{-1}$ from the Galactic Center. The total mass of the cylinder isestimated to be $\sim 8.5\times 10^5 M_\odot$ and kinetic energy $\sim 3\times10^{53}$ ergs.

One-kpc Expanding Cylinder of HI-Gas around the Galactic Center