Switched capacitor: Difference between revisions
The initial derivation equation is wrong. It was V = Vout - Vin which is supposed to be V = Vin - Vout. |
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/ | {{dablink|Not to be confused with [[Hubble's law]] which relates galaxy redshifts and distances.}} | ||
{{Use dmy dates|date=July 2012}} | |||
} | The '''Hubble–Reynolds law''' models the [[surface brightness]] of [[elliptical galaxy|elliptical galaxies]] as | ||
:<math>I(R) = \frac{I_0}{(1+R/R_H)^2}</math> | |||
Where <math>I(R)</math> is the [[surface brightness]] at radius <math>R</math>, <math>I_0</math> is the central brightness, and <math>R_H</math> 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 [[Sérsic law]] for elliptical galaxies.<ref>Binney & Tremaine. ''Galactic Dynamics'' 2008.</ref> | |||
} | The law is named for the astronomers [[Edwin Hubble]] and [[John Reynolds (astronomer)|John Henry Reynolds]]. | ||
==References== | |||
{{reflist|colwidth=30em}} | |||
{{DEFAULTSORT:Hubble-Reynolds law}} | |||
[[Category:Astrophysics]] | |||
{{astronomy-stub}} | |||
Revision as of 02:26, 4 February 2014
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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 Sérsic law for elliptical galaxies.[1]
The law is named for the astronomers Edwin Hubble and John Henry Reynolds.
References
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- ↑ Binney & Tremaine. Galactic Dynamics 2008.