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Physical Contact between the +20 km s−1 Cloud and the Galactic Circumnuclear Disk

Published online by Cambridge University Press:  09 February 2017

Shunya Takekawa ,
Tomoharu Oka  and
Kunihiko Tanaka
Shunya Takekawa
Affiliation:
School of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan email: shunya@z2.keio.jp
Tomoharu Oka
Affiliation:
School of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan email: shunya@z2.keio.jp Department of Physics, Institute of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan
Kunihiko Tanaka
Affiliation:
Department of Physics, Institute of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan
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Abstract

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We report the discovery of physical contact between the Galactic circumnuclear disk (CND) and an adjacent giant molecular cloud. The central 10 pc of our Galaxy has been imaged in molecular lines at millimeter wavelength using the Nobeyama Radio Observatory 45 m radio telescope. In the position-velocity maps of several high-density probe lines, we have found an emission “bridge” connecting the +20 km s−1 cloud (M–0.13–0.08) and the negative longitude extension of the CND. The collision between the +20 km s−1 cloud and the CND may be responsible for the formation of the bridge. This event can promote mass accretion onto the CND and/or into the inner cavity.

Keywords

Galaxy: centergalaxies: nucleiISM: moleculesradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 145 - 146
Copyright
Copyright © International Astronomical Union 2017 

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