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The largest molecular complexes in the first Galactic quadrant

  • T. M. Dame (a1), B. G. Elmegreen (a1), R. S. Cohen (a1) and P. Thaddeus (a1)

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The CO emission within a few kiloparsecs of the Sun is dominated by a small number of very large molecular complexes, including those associated with the Orion Nebula (Thaddeus 1982), M16 and M17 (Elmegreen, Lada, and Dickinson 1979), and NGC7538 (Cohen et al. 1980). These complexes have masses from several 105 to 106 M and are generally very well-defined objects. They are also well endowed with HII regions, stellar clusters and associations, masers, and other Population-I objects whose distances can be measured. The complexes are thus valuable probes of the large-scale structure of the Galaxy.

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References

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Burton, W.B., and Gordon, M.A.: 1978, Astron. Astrophys. 63, p. 7.
Cohen, R.S., and Thaddeus, P.: 1977, Ap. J. 217, p. L155.
Cohen, R.S., Cong, H., Dame, T.M., and Thaddeus, P.: 1980, Ap. J. 239, p. L53.
Dame, T.M.: 1983, Ph.D. dissertation, Columbia University.
Elmegreen, B.G., Lada, C.J., and Dickinson, D.F.: 1979, Ap. J. 230, p. 415.
Lebrun, F., et al.: 1983, Ap. J., in press.
Thaddeus, P.: 1982, Ann. N.Y. Acad. Sci. 395, p. 9.
Shane, W.W.: 1972, Astron. Astrophys. 16, p. 118.

The largest molecular complexes in the first Galactic quadrant

  • T. M. Dame (a1), B. G. Elmegreen (a1), R. S. Cohen (a1) and P. Thaddeus (a1)

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