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

Abstract

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.

Accepted for PASJ Letters. 4 pages 3 figures

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