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Kinematics of the Ultra-High-Velocity Gas in the Expanding Molecular Shell Adjacent to the W44 Supernova Remnant

Published online by Cambridge University Press:  09 February 2017

Masaya Yamada ,
Tomoharu Oka ,
Kunihiko Tanaka ,
Mariko Nomura ,
Shunya Takekawa ,
Yuhei Iwata ,
Sekito Tokuyama ,
Keisuke Tanabe ,
Shiho Tsujimoto  and
Maiko Furusawa
Masaya Yamada
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Tomoharu Oka
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Kunihiko Tanaka
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Mariko Nomura
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Shunya Takekawa
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Yuhei Iwata
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Sekito Tokuyama
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Keisuke Tanabe
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Shiho Tsujimoto
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
Maiko Furusawa
Affiliation:
Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan email: yamada@aysheaia.phys.keio.ac.jp
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High-velocity compact cloud (HVCC) is a peculiar category of molecular clouds detected in the central molecular zone of our Galaxy (Oka et al. 1998, 2007, and 2012). They are characterized by compact appearances (d < 5 pc) and very large velocity widths (Δ V > 50 km s−1). Some of them show high CO J=3–2/J=1–0 intensity ratios (≥ 1.5), indicating that they consist of dense and warm molecular gas. Dispite a number of efforts, we have not reached a comprehensive interpretation of HVCCs. Recently, we detected an extraordinaly broad velocity width feature, the ‘Bullet’, in the molecular cloud interacting with the W44 supernova remnant. The Bullet shares essential properties with HVCCs. Because of its proximity, a close inspection of the Bullet must contribute to the understanding of HVCCs.

Keywords

ISM: cloudsISM: molecules(ISM:) supernova remnantsISM: kinematics and dynamics
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. 151 - 153
Copyright
Copyright © International Astronomical Union 2017 

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