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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 effective radius ： ウィキペディア英語版 effective radius The effective radius ($R\_e$) of a galaxy is the radius at which half of the total light of the system is emitted.〔(【引用サイトリンク】url=http://astronomy.swin.edu.au/cms/astro/cosmos/h/Half-light+Radius )〕 This assumes the galaxy has either intrinsic spherical symmetry or is at least circularly symmetric as viewed in the plane of the sky. Alternatively, a half-light contour, or isophote, may be used for spherically and circularly asymmetric objects. $R\_e$ is an important length scale in de Vaucouleurs $\backslash sqrt()\; R$ law, which characterizes a specific rate at which surface brightness decreases as a function of radius: :$$ I(R) = I_e \cdot e^ where $I\_e$ is the surface brightness at $R\; =\; R\_e$. At $R\; =\; 0$, :$$ I(R=0) = I_e \cdot e^ \approx 2000 \cdot I_e Thus, the central surface brightness is approximately $2000\; \backslash cdot\; I\_e$. ==See also== 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「effective radius」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.