Concept information
Preferred term
H I region
Definition(s)
- An HI region is an interstellar cloud composed primarily of atomic hydrogen, detectable by its radio wave emission in the 21-centimeter line. HI regions have a density of 1 to 10 atoms/cm3 and a temperature of about 125 K (the spin temperature of neutral hydrogen). At least 95% of interstellar hydrogen is HI. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/H/HI.html)
Broader concept(s)
Synonym(s)
- H1 region
- H I cloud
- HI region
In other languages
-
French
-
nuage H I
-
région H1
-
région HI
URI
http://data.loterre.fr/ark:/67375/MDL-J8K8RTSN-L
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