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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 Einasto profile ： ウィキペディア英語版 Einasto profile The Einasto profile (or Einasto model) is a mathematical function that describes how the density $\backslash rho$ of a spherical stellar system varies with distance $r$ from its center. Jaan Einasto introduced his model at a 1963 conference in Alma-Ata, Kazakhstan.〔J. Einasto (1965), Kinematics and dynamics of stellar systems, ''Trudy Inst. Astrofiz. Alma-Ata'' 5, 87〕 The Einasto profile has the form :$$ \rho(r) \propto \exp . The parameter $\backslash alpha$ controls the degree of curvature of the profile. This can be seen by computing the slope on a log-log plot: :$$ d\ (\log\rho)/d\ (\log r) \propto -r^ . The larger $\backslash alpha$, the more rapidly the slope varies with radius (see figure). Einasto's law can be described as a generalization of a power law, $\backslash rho\backslash propto\; r^$, which has a constant slope on a log-log plot. Einasto's model has the same mathematical form as Sersic's law, which is used to describe the surface brightness (i.e. projected density) profile of galaxies. Einasto's model has been used to describe many types of system, including galaxies〔J. Einasto and U. Haud (1989), ( Galactic models with massive corona. I - Method. II - Galaxy ) ''Astron. Astrophys.'' 223, 89〕 and dark matter halos. == References == 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「Einasto profile」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.