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4.7. The CO 2–1/1–0 ratio in the disk and center of the Milky Way Galaxy

  • Tetsuo Hasegawa (a1), Jun-Ichi Morino (a1), Tsuyoshi Sawada (a1), Toshihiro Handa (a1), Kumiko Sato (a2), Tomoharu Oka (a3), Seiichi Sakamoto (a3), Kazuo Sorai (a4), Masumichi Seta (a5), Masahiko Hayashi (a5), Leonardo Bronfman (a6), Jorge May (a6), Roy Booth (a7), Lars-Åke Nyman (a7) and Peter Shaver (a8)...

Extract

We are conducting a survey of the CO J=2-1 line emission in the southern Milky Way (the Tokyo-Onsala-ESO-Calán Galactic CO survey), using the 60-cm radio telescope (VST2) in La Silla, Chile. It is combined with the northern survey made with the identical telescope (VST1) at Nobeyama (e.g., Sakamoto et al. 1995), and is directly comparable with the Columbia survey of the CO J=1-0 emission (e.g., Dame et al. 1987).

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References

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Dame, T. M., Ungrechts, H., Cohen, R. S., de Geus, E. J., Grenier, I.A., May, J., Murphy, D. C., Nyman, L. Å., & Thaddeus, P. (1987) A composite CO survey of the entire Milky Way, ApJ, 322, pp. 706720.
Oka, T., Hasegawa, T., Hayashi, M., Handa, T., & Sakamoto, S. (1997) CO (J=2-1) line observations of the Galactic center molecular cloud complex. II. Dynamical structure and physical conditions, ApJ in press.
Sakamoto, S., Hasegawa, T., Hayashi, M., Handa, T., & Oka, T. (1995) An out-of-plane CO (J=2-1) survey of the Milky Way. I. The data, ApJS, 100, pp. 125131.

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