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

TL;DR
This paper reports the discovery of a large, expanding HI gas cylinder around the Galactic Center, characterized by specific dimensions, velocity, and mass, likely driven by a high-velocity wind.
Contribution
It presents the first identification and detailed analysis of a 1-kpc expanding HI gas cylinder around the Galactic Center, suggesting a wind-driven origin.
Findings
Cylinder radius: 1 kpc
Expansion velocity: 150 km/s
Mass: 8.5 x 10^5 solar masses
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 and rotating at 100 km s, and is interpreted as due to a high-velocity conical wind at km s from the Galactic Center. The total mass of the cylinder is estimated to be and kinetic energy ergs.
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astronomy and Astrophysical Research
