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Central massive object
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Central massive object : ウィキペディア英語版
Central massive object

Central massive object (CMO) refers to a mass concentration at the center of a galaxy.
It can be either a supermassive black hole or a nuclear star cluster, i.e., a dense cluster of stars.
The most massive galaxies are believed to always contain a supermassive black hole (SBH); these galaxies do not contain nuclear star clusters, and the CMO is identified with the SBH. Fainter galaxies usually contain a nuclear star cluster (NSC); in most of these galaxies it is not known whether a supermassive black hole is present, and the CMO is identified with the NSC. A few galaxies, for instance the Milky Way and NGC 4395, are known to contain both a SBH and a NSC.
The mass associated with CMOs is roughly 0.1-0.3% times the total mass of the galactic bulge.〔
==See also==

*Stellar dynamics

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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