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Small-scale Properties of HI in Nearby Galaxies

Published online by Cambridge University Press:  03 August 2017

Robert Braun
Robert Braun*
Affiliation:
NFRA, P.O. Box 2 7990 AA Dwingeloo The Netherlands

Abstract

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The instrumental requirements and current observational results are outlined for the study of resolved neutral hydrogen structures in both emission and absorption in external galaxies. Neutral super-shell structures exterior to ionized shells around OB associations seem to be a common phenomenon. Further analysis of existing data should allow quantification of the degree and rate of energy deposition in the ISM by massive stars. HI absorption studies offer great promise in constraining the physical properties of the neutral ISM, including an estimate of the gas pressure. Together these data will provide hard constraints on the existence and prevalence of chimney formation, and hence disk – halo interactions in a variety of galactic environments.

Type
II. The Disk-Halo Interface in Other Galaxies
Information
Symposium - International Astronomical Union , Volume 144: The Interstellar Disk-Halo Connection in Galaxies , 1991 , pp. 213 - 222
Copyright
Copyright © Kluwer 1991 

References

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