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Signature of an Intermediate-Mass Black Hole in the Central Molecular Zone of Our Galaxy

Published online by Cambridge University Press:  09 February 2017

Tomoharu Oka ,
Reiko Mizuno ,
Kodai Miura  and
Shunya Takekawa
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: tomo@phys.keio.ac.jp
Reiko Mizuno
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: tomo@phys.keio.ac.jp
Kodai Miura
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: tomo@phys.keio.ac.jp
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: tomo@phys.keio.ac.jp
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Abstract

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The high-velocity compact cloud CO–0.40–0.22 was mapped in 22 molecular lines with the NRO 45 m radio telescope and the ASTE 10 m telescope. The map of each detected line shows that this cloud has a compact appearance (d≃3 pc) and extremely broad velocity width (Δ V≃100 km s−1). The representative position–velocity map along the major axis shows that CO–0.40–0.22 consists of an intense region with a shallow velocity gradient and a less intense high-velocity wing. This kinematical structure can be attributed to a gravitational kick to the molecular cloud caused by an invisible compact object with a mass of ~105M⊙. Its compactness and the absence of a counterpart at other wavelengths suggest that this massive object is an intermediate-mass black hole.

Keywords

galaxies: nuclei–Galaxy: center–ISM: clouds–ISM: molecules
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. 119 - 122
Copyright
Copyright © International Astronomical Union 2017 

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