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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 Sersic index ： ウィキペディア英語版 Sersic profile The Sérsic profile (or Sérsic model or Sérsic's law) is a mathematical function that describes how the intensity $I$ of a galaxy varies with distance $R$ from its center. It is a generalization of de Vaucouleurs' law. José Luis Sersic first published his law in 1963.〔J. L. Sérsic (1963), ( Influence of the atmospheric and instrumental dispersion on the brightness distribution in a galaxy )〕 ==Definition== The Sérsic profile has the form :$$ \ln\ I(R) = \ln\ I_ - k R^ , where $I\_$ is the intensity at $R=0$. The parameter $n$, called the "Sérsic index," controls the degree of curvature of the profile (see figure). The smaller the value of $n$, the less centrally concentrated the profile is and the shallower (steeper) the logarithmic slope at small (large) radii is: :$$ \frac = -(k/n)\ R^ . 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「Sersic 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.