Astrophysics (Index)About

galaxy subgroup

(subgroup)
(group of fifty or fewer gravitationally bound Milky-Way-sized galaxies)

The term subgroup (for galaxy subgroup) essentially means a subgroup of a galaxy group or galaxy cluster, consisting of a significant galaxy plus its satellite galaxies. Such grouping is often determined by proximity but may be checked with mass and velocity determination. Within the Local Group, the term is used for the Milky Way subgroup, the Andromeda subgroup (aka M31 subgroup) and the Triangulum subgroup (aka M33 subgroup).


(galaxy clusters,galaxies)
Further reading:
http://en.wikipedia.org/wiki/Galaxy_group
http://en.wikipedia.org/wiki/Galaxy_groups_and_clusters
http://en.wikipedia.org/wiki/Satellite_galaxies_of_the_Milky_Way

Referenced by pages:
galaxy group
Milky Way subgroup

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