H-alpha scans of the intergalactic H I cloud in Leo
Journal Article
·
· Astrophys. J.; (United States)
Scans of H-alpha were obtained for two fields within the large, intergalactic H I cloud in Leo. The data provide a conservative upper limit of 1.7 x 10 to the -7th ergs/sq cm/s/sr on the H-alpha surface brightness of the cloud. This limit corresponds to an emission measure of less than 2 cm exp -6 pc for gas at a temperature of 10,000 K and implies an ionized hydrogen mass of less than 9 x 10 to the 9th f exp 1/2 solar mass within the cloud, where f is the filling fraction of the gas. This intensity may have important implications for possible sources of the ionization. 17 references.
- Research Organization:
- Wisconsin Univ., Madison
- OSTI ID:
- 6635331
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 309; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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