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Physical Conditions of Molecular Gas in the Galaxy

  • S. Sakamoto (a1), T. Hasegawa (a1), T. Handa (a1), T. Oka (a1) and M. Hayashi (a2)...

Extract

Physical conditions of molecular gas are key parameters to the formation rate and initial mass function of stars formed in molecular clouds. The ongoing Tokyo-NRO survey has been observing the Galactic CO (J=2–1) emission with a beamsize matched to the Columbia CO (J=1–0) survey. Intensities of the two lines should reflect physical conditions of the CO-emitting gas. An out-of-plane survey of the inner Galaxy which covers from 20° to 60° in galactic longitude and from −1° to +1° in galactic latitude with grid spacings of 0.25° has already been made (Sakamoto et al. 1994). Its coverage is large enough to draw conclusions on global properties of molecular gas in the inner Galaxy.

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References

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Bronfman, L., Cohen, R. S., Alvarez, H., May, J., & Thaddeus, P. 1988, ApJ, 324, 248
Cohen, R. S., Dame, T. M., & Thaddeus, P. 1986, ApJS, 60, 695
Handa, T., Hasegawa, T., Hayashi, M., Sakamoto, S., Oka, T., & Dame, T. M. 1993, in Back to the Galaxy, ed. Holt, S. S. & Verter, F. (New York : AIP), 315
Sakamoto, S., Hasegawa, T., Hayashi, M., Handa, T., & Oka, T. 1994, ApJS, submitted

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