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Tidally-disrupted Molecular Clouds falling to the Galactic Center

Published online by Cambridge University Press:  09 February 2017

Masato Tsuboi ,
Yoshimi Kitamura ,
Kenta Uehara ,
Ryosuke Miyawaki  and
Atsushi Miyazaki
Masato Tsuboi
Affiliation:
Institute of Space and Astronautical Science, JAXA, Sagamihara, Kanagawa 252-5210, Japan email: tsuboi@vsop.isas.jaxa.jp
Yoshimi Kitamura
Affiliation:
Institute of Space and Astronautical Science, JAXA, Sagamihara, Kanagawa 252-5210, Japan email: tsuboi@vsop.isas.jaxa.jp
Kenta Uehara
Affiliation:
Department of Astronomy, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
Ryosuke Miyawaki
Affiliation:
College of Arts and Sciences, J.F. Oberlin University, Machida, Tokyo 194-0294, Japan
Atsushi Miyazaki
Affiliation:
Japan Space Forum, Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
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Abstract

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We found a molecular cloud connecting from the outer region to the “Galactic Center Mini-spiral (GCMS)” which is a bundle of the ionized gas streams adjacent to Sgr A*. The molecular cloud has a filamentary appearance which is prominent in the CS J=2-1 emission line and is continuously connected with the GCMS. The velocity of the molecular cloud is also continuously connected with that of the ionized gas in the GCMS observed in the H42α recombination line. The morphological and kinematic relations suggest that the molecular cloud is falling from the outer region to the vicinity of Sgr A*, being disrupted by the tidal shear of Sgr A* and ionized by UV emission from the Central Cluster. We also found the SiO J=2-1 emission in the boundary area between the filamentary molecular cloud and the GCMS. There seems to exist shocked gas in the boundary area.

Keywords

Galaxy: centerstars: formationISM: cloudsISM: 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. 115 - 118
Copyright
Copyright © International Astronomical Union 2017 

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