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NGC 6166 is an elliptical galaxy in the Abell 2199 cluster. It lies 490 million light years away in the constellation Hercules. The primary galaxy in the cluster is one of the most luminous galaxies known in terms of X-ray emissions. ==Description== NGC 6166 is a supermassive, type cD galaxy and one fine example of this type of galaxy, with several smaller galaxies within its envelope.〔(Notes for object NGC 6166 (NED) )〕 It is suspected to have formed through a number of galaxy collisions. It has a large number of globular clusters (between 6,200-22,000) orbiting the galaxy.〔http://adsabs.harvard.edu/full/1990ApJ...355..410P〕 The galaxy harbors a supermassive black hole at its center with a mass of 1 billion . NGC 6166 is known to host an active nucleus, classified as an FR I source, which powers two symmetric parsec-scale radio jets and radio lobes and it is caused by the infall of gas into its center caused by a cooling flow that deposits 200 solar masses of gas every year there.〔 It has been proposed that a number of O-type stars may be present in the center of NGC 6166 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NGC 6166」の詳細全文を読む スポンサード リンク
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