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CO in the Milky Way

Published online by Cambridge University Press:  25 May 2016

Leo Blitz*
Affiliation:
Astronomy Department, University of Maryland, College Park, MD 20742 USA

Abstract

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If the CO distribution of the Milky Way is described as a truncated exponential rather than as a molecular ring with some gas at large radii, it becomes easier to understand the evolution of the disk of stars. The star formation rate per unit molecular gas mass is constant as a function of radius, and the H2 depletion time turns out to be only a few percent of the Hubble time. This very short timescale requires that the atomic gas act as a reservoir for the active star forming gas. Because the HI has such a different radial distribution, there must either be infall from outside the Galaxy, an efficient way for the atomic gas in the disk to lose angular momentum, or both, leading to measurable infall or inflow velocities. The truncation radius of CO is probably due to the recently identified stellar bar.

Type
Molecular Clouds in the Milky Way
Copyright
Copyright © Kluwer 1997 

References

Bloemen, J.B.G.M., et al. 1986, A&A, 154, 25 Google Scholar
Bieging, J. 1989, in The Evolution of the Interstellar Medium , Blitz, L., ed., ASP: San Francisco, 137 Google Scholar
Binney, J. et al. 1991, MNRAS, 252, 210 CrossRefGoogle Scholar
Blitz, L. 1994, in Back to the Galaxy , Holt, S.S. & Verter, F., eds., AIP Press: New York, 98 Google Scholar
Blitz, L., Bloemen, J.B.G.M., Hermsen, W., & Bania, T.M. 1985, A&A, 143, 267 Google Scholar
Blitz, L., et al 1993, Nature , 361, 417 Google Scholar
Burton, W.B. & Gordon, M.A. 1978, A&A, 63, 7 Google Scholar
Cohen, R.S. 1977, Ph.D. Dissertation, Columbia University Google Scholar
Dame, T. et al. 1987, ApJ, 322, 706 Google Scholar
Dame, T. 1993, in Back to the Galaxy , Holt, S.S. & Verter, F., eds., AIP Press: New York, 267.Google Scholar
de Vaucouleurs, G. 1964, in The Galaxy and the Magellanic Clouds , eds. Kerr, F.J. & Rodgers, A.W., Australian Academy of Science: Sydney, 195 Google Scholar
Güsten, R., & Mezger, P. 1983, Vistas Astr., 26, 159 Google Scholar
Henderson, A.P., Jackson, P.D., & Kerr, F.J. 1982, ApJ, 263 116 Google Scholar
Kenney, J., et al. 1992, ApJ, 395, L79 CrossRefGoogle Scholar
Knapp, G.R. 1991 in Frontiers of Stellar Evolution , Lambert, D. L. ed., ASP: San Francisco, 229 Google Scholar
Kulkarni, S.R., & Fich, M. 1985, ApJ, 290, 792 Google Scholar
Lacey, C.G. & Fall, S.M. 1985 ApJ, 290, 154 Google Scholar
Lyne, A., Manchester, R. & Taylor, J. 1985, MNRAS, 213, 613 Google Scholar
Spergel, D.N., Malhotra, S., & Blitz, L. 1996, in Spiral Galaxies in the Near-IR, ESO-Garching, Minnitti, D. & Rix, H., eds., ESO-Garching, in press Google Scholar
Metzger, M.R., & Schechter, P.L. 1994, ApJ, 420, 177 Google Scholar
Miller, G., & Scalo, J. 1979, ApJS, 41, 513 Google Scholar
Prantzos, N., & Aubert, O. 1995, A&A, 302, 69 Google Scholar
Regan, M. 1996, Ph. D. Dissertation, University of Maryland Google Scholar
Sanders, D.B., Solomon, P.M., & Scoville, N.Z. 1984, ApJ, 276, 182.Google Scholar
Sanders, R.H. & Huntley, J.M. 1976, ApJ, 209, 53 Google Scholar
Schwartz, P.R., Wilson, W.J., & Epstein, E.E. 1972, ApJ, 186, 529 CrossRefGoogle Scholar
Sodroski, T., et al. 1994, ApJ, 428, 638 Google Scholar
Spergel, D.N., Malhotra, S., & Blitz, L. 1996, in Spiral Galaxies in the Near-IR , Minnitti, D. & Rix, H., eds. ESO-Garching, in press Google Scholar
Strong, A.W., & Mattox, J. 1996, A&A (Lett.), 308, 21 Google Scholar
van Buren, D. 1985, ApJ, 294, 567 CrossRefGoogle Scholar
Wakker, B. 1993, Ph. D. Dissertation, University of Leiden Google Scholar
Wouterloot, J.G.A., Brand, J., Burton, W.B., & Kwee, K.K. 1990, A&A, 230, 21 Google Scholar
Wilson, R.W., Jefferts, K.B. & Penzias, A.A. 1970, ApJ, 161, L43 Google Scholar
Wilson, W.J., et al. 1974, ApJ, 191, 357 Google Scholar