A CO(J=2-1) line survey of the Galactic center

T. Sawada, T. Hasegawa, T. Handa, K. S. Usuda, J. I. Morino, R. Booth, L. Bronfman, A. Luna C., M. Hayashi, L. Å Nyman, T. Oka, S. Sakamoto, M. Seta, P. Shaver, K. Sorai

研究成果: Article査読

2 被引用数 (Scopus)


We have observed the Galactic center in 12 CO(J = 2-1) and 13 CO(J = 2-1) lines using the Tokyo-Onsala-ESO-Calán 60-cm telescope and compared the data with the 12 CO(J = 1-0) Columbia survey (Bitran et al. 1997). The 12 CO J = 2-1/J = 1-0 intensity ratio is very high (0.96) in the central 900 pc of the Galaxy, although it is about 0.6-0.7 for typical molecular clouds in the Galactic disk. The observed intensity ratios, 12 CO J = 2-1/J = 1-0 and 13 CO/ 12 CO (J = 2-1), indicate that even the 12 CO line is not very optically thick: τ12 CO(J=1-0) ∼ 1 or smaller in the Galactic center. This may be due to high temperature and large velocity dispersion. The large velocity dispersion is probably caused by large external pressure and tidal forces.

ジャーナルAdvances in Space Research
出版ステータスPublished - 1999

ASJC Scopus subject areas

  • 航空宇宙工学
  • 天文学と天体物理学
  • 地球物理学
  • 大気科学
  • 宇宙惑星科学
  • 地球惑星科学(全般)


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