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.

arXiv commentAccepted for PASJ Letters. 4 pages 3 figures

References in corpus (16)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• GASS: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release
• The Large-scale Bipolar Wind in the Galactic Center
• Gas flow models in the Milky Way embedded bars
• A Dynamical Model for Gas Flows, Star Formation, and Nuclear Winds in Galactic Centres
• Atomic Hydrogen in a Galactic Center Outflow
• X-ray and Gamma-ray Observations of the Fermi Bubbles and NPS/Loop I Structures
• The ATCA HI Galactic Center Survey
• Observation of Acceleration of HI Clouds Within the Fermi Bubbles
• Tracing the Milky Way Nuclear Wind with 21cm Atomic Hydrogen Emission
• Recognizing the fingerprints of the Galactic bar: a quantitative approach to comparing model (l,v) distributions to observation
• The 200-pc Molecular Cylinder in the Galactic Centre
• Interaction of the Galactic-Centre Super Bubbles with the Gaseous Disc
• Giant HI Hole inside the 3-kpc Ring and the North Polar Spur - The Galactic Crater -
• Diagnostics of Gaseous Halo of the Milky Way by a Shock Wave from the Galactic Centre

Cited by in corpus (4)

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