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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ostriker–Peebles criterion ： ウィキペディア英語版 Ostriker–Peebles criterion In astronomy, the Ostriker–Peebles criterion, named after its discoverers Jeremiah Ostriker and Jim Peebles, describes the formation of barred galaxies. The rotating disc of a spiral galaxy, consisting of stars and solar systems, may become unstable in a way that the stars in the outer parts of the "arms" are released from the galaxy system, resulting in the collapse of the remaining stars into a bar-shaped galaxy. This occurs in approximately 1/3 of the known spiral galaxies. Based on the first kinetic energy component ''T'' and the total kinetic energy ''W'', a galaxy will become barred when $\backslash frac\; >\; 0.15$. == External links == * (About barred galaxies ) 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「Ostriker–Peebles criterion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.