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A2261-BCG
A2261-BCG (short for Abell 2261 Brightest Cluster Galaxy) is a huge elliptical galaxy in the cluster Abell 2261. One of the largest galaxies known, A2261-BCG is estimated to have a diameter of a million light-years, some 10 times larger than our own galaxy. It is the brightest and the most massive galaxy in the cluster, and is notable for having the largest galactic core ever observed, spanning more than 10,000 light-years.〔(【引用サイトリンク】 work=Monster Galaxy May Have Been Stirred Up By Black-hole Mischief )〕
The cD elliptical galaxy, located at least 3 billion light-years from Earth, is also well known as a radio source.〔 Its core is highly populated by a dense number of old stars, and is mysteriously diffuse, making it to have a large core.〔
In September 10, 2012, using Hubble's Wide Field Camera 3, scientists found out that there was no supermassive black hole present in the center.〔 This may be probably the cause of its diffuse, large core, but it contradicts modern galactic evolutionary theories, since a huge cD galaxy like A2261-BCG must have been expected to have a supermassive black hole.〔 No reasons are valid to explain the said problem until now.
==References==
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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