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A high-velocity molecular cloud near the center of the galaxy

Oka, Tomoharu; White, Glenn J.; Hasegawa, Tetsuo; Sato, Fumio; Tsuboi, Masato and Miyazaki, Atsushi (1999). A high-velocity molecular cloud near the center of the galaxy. The Astrophysical Journal, 515(1) pp. 249–255.

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We report the detection of a peculiar molecular cloud, CO 0.02-0.02, lying about 5' Galactic east from the center of the Galaxy. 12CO images taken with Nobeyama Radio Observatory (NRO) 45 m telescope showed that it is relatively compact (~3×4 pc2) as well as having a very large velocity width (ΔV≥100 km s-1). The cloud has a virial mass about 1 order of magnitude larger than the LTE mass, 9×104 Mʘ, indicating the cloud is apparently gravitationally unbound. New observations with the James Clerk Maxwell Telescope 15 m and the NRO 45 m telescopes show that CO 0.02-0.02 is very bright in the CO (J=3-2) and in the HCN and HCO+ (J=1-0) lines. It appears that the environment may have an unusually high density and temperature, which may be related to the very broad CO line width. We propose that CO 0.02-0.02 may have been accelerated, heated, and compressed in a series of supernovae shocks that have occurred within the last (3-5)×104 yr.

Item Type: Journal Item
Copyright Holders: 1999 The American Astronomical Society
ISSN: 1538-4357
Keywords: galactic centre; clouds; molecules
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 31822
Depositing User: G. J. White
Date Deposited: 15 Feb 2012 09:21
Last Modified: 07 Dec 2018 10:01
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