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Structure and evolution of fossil H II regionsThe structure and evolution of a fossil H II region created by a burst of ionizing radiation from a supernova is considered. The cooling time scale for the shell is about 10 to the 6th power years. Superposition of million-year-old fossil H II regions may account for the temperature and ionization of the interstellar medium. Fossil H II regions are unstable to growth of thermal condensations. Highly ionized filamentary structures form and dissipate in about 10,000 years. Partially ionized clouds form and dissipate in about 10 to the 6th power years.
Document ID
19720004109
Document Type
Conference Paper
Authors
Mccray, R. (Harvard Coll. Observatory Cambridge, MA, United States)
Schwarz, J. (Harvard Coll. Observatory Cambridge, MA, United States)
Date Acquired
August 6, 2013
Publication Date
September 1, 1971
Publication Information
Publication: NASA. Goddard Space Flight Center The Gum Nebula and Related Probl.
Subject Category
SPACE SCIENCES
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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