Hubble–Reynolds law

The Hubble–Reynolds law models the surface brightness of elliptical galaxies as

I(R)={\frac {I_{0}}{(1+R/R_{H})^{2}}}

Where $I(R)$ is the surface brightness at radius $R$ , $I_{0}$ is the central brightness, and $R_{H}$ 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.^[1]

The law is named for the astronomers Edwin Hubble and John Henry Reynolds.

References

↑ Binney & Tremaine. Galactic Dynamics 2008.

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[1] Binney & Tremaine. Galactic Dynamics 2008.