Concept information
Preferred term
irregular galaxy
Definition(s)
- An irregular galaxy is a galaxy, with a poorly-defined structure, that falls outside the categories of disk galaxy or elliptical galaxy. Only about 3% of observed galaxies fall into this category. Two main types are recognized in the Hubble classification scheme. Type Irr I galaxies are less massive (10⁸to 10¹⁰ solar masses) than large ellipticals or spirals and often have a high gas content and show evidence of extensive star formation. Type Irr II galaxies make up a catchall group that may, in some cases, include interacting and merging systems. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/I/irregular_galaxy.html)
Broader concept(s)
Narrower concept(s)
In other languages
-
French
URI
http://data.loterre.fr/ark:/67375/MDL-JC33RX73-T
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