A CO J = 3–2 Survey of the Galactic Center | Zendy

Tomoharu Oka | Zendy; M. Nagai | Zendy; Kamegai Kazuhisa | Zendy; Kunihiko Tanaka | Zendy; Kuboi Nobuyuki | Zendy

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A CO J = 3–2 Survey of the Galactic Center

Author(s) -

Tomoharu Oka,

M. Nagai,

Kamegai Kazuhisa,

Kunihiko Tanaka,

Kuboi Nobuyuki

Publication year - 2007

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/59.1.15

Subject(s) - physics , astrophysics , galactic center , spiral galaxy , galaxy , molecular cloud , supernova , astronomy , telescope , disc , galaxy formation and evolution , stars

We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J=3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows high J=3-2/J=1-0 intensity ratio (~ 0.9) while gas in the spiral arms in the Galactic disk shows the lower ratio (~ 0.5). The high-velocity compact cloud CO 0.02-0.02 and the hyperenergetic shell CO 1.27+0.01, as well as gas in the Sgr A region exhibit high J=3-2/J=1-0 intensity ratio exceeding 1.5. We also found a number of small spots of high ratio gas. Some of these high ratio spots have large velocity widths and some seem to associate with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae which may be abundant in the CMZ

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