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Hubble–Reynolds law : ウィキペディア英語版 | Hubble–Reynolds law
The Hubble–Reynolds law models the surface brightness of elliptical galaxies as : Where is the surface brightness at radius , is the central brightness, and is the radius at which the surface brightness is diminished by a factor of 1/4. It is asymptotically similar to the De Vaucouleurs' law which is a special case of the Sersic profile for elliptical galaxies.〔Binney & Tremaine. ''Galactic Dynamics'' 2008.〕 The law is named for the astronomers Edwin Hubble and John Henry Reynolds. ==References==
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