A CO J = 3-2 survey of the galactic center

Tomoharu Oka, Makoto Nagai, Kazuhisa Kamegai, Kunihiko Tanaka, Nobuyuki Kuboi

研究成果: Article査読

62 被引用数 (Scopus)

抄録

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 a high J=3-2/J=1-0 intensity ratio (∼ 0.9), while gas in the spiral arms of the Galactic disk shows a 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 ratios 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 be associated with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae, which may be abundant in the CMZ.

本文言語English
ページ(範囲)15-23
ページ数9
ジャーナルPublications of the Astronomical Society of Japan
59
1
DOI
出版ステータスPublished - 2007
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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