Abstract
The discovery of HI shells and supershells in distant parts of the galaxy (Heiles, 1979) utilized the Weaver/Williams (WW; 1973) HI survey of the galactic plane, which is restricted to |b|< 10°. These shells have diameters ranging up to 2 kpc, and some expand with velocities up to 24 km/sec. If produced by stellar winds and supernovae, a very large--perhaps unreasonably large--number of massive stars in a young cluster is required.
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References
Heiles, C. 1979, Astrophys J. 229, pp. 533–544.
Heiles, C. and Habing, H.J. 1974, Astron. & Astrophys. Suppl. 14, pp. 1–556.
Weaver, H.F. and Williams. D.R. 1973, Atron. & Astrophys. Suppl. 8, pp. 1–504.
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© 1983 D. Reidel Publishing Company, Dordrecht, Holland
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Heiles, C. (1983). More HI Shells and Supershells or a New Explanation of “Noncircular Motions” in the Galaxy. In: Shuter, W.L.H. (eds) Kinematics, Dynamics and Structure of the Milky Way. Astrophysics and Space Science Library, vol 100. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7060-1_18
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DOI: https://doi.org/10.1007/978-94-009-7060-1_18
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