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Sigma in cosmology was a property of galaxies used when trying to work out the mystery of galaxies and their supermassive black holes. ==History== In the late 1990s the NUKER experts had made observations with a spectroscope of two galaxies, one of an active galaxy with an active galactic nucleus called NGC10-68 and a dormant galaxy next door to us named Andromeda. The observations are shown. The light from the centre in Andromeda galaxy was distorted proving the existence of super-massive black holes. Other observations proved most galaxies had a similar centre whether it be active or dormant. They then realised that the black holes must have something to do with a galaxy's formation, so they turned to something they thought was useless: the speed of the stars around the edge of the galaxy. This was Sigma, the speed of the stars at the edge of the galaxy supposedly unaffected by the mass of the black hole at the centre. 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「Sigma (cosmology)」の詳細全文を読む スポンサード リンク
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