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de Vaucouleurs' profile

(de Vaucouleurs' law, R to the 1/4 law)
(relation between elliptical galaxy surface brightness and distance from center)

The de Vaucouleurs' profile (or de Vaucouleurs' law, or R to the 1/4 Law) is a relation between the surface brightness of a point on an elliptical galaxy and that point's distance from the galaxy's center.

ln ΣR = ln Σ0 - k R1/4

This is an empirical relation and unfortunately it has limited use for determining other information, but is a relation that any theory of elliptical galaxies had best reproduce. I believe some models of galaxy mergers appear to produce galaxies with such a relation, consistent with the notion that elliptical galaxies are often the result of mergers.

Other such empirical relations regarding galaxy surface brightness have been devised.


(relation,galaxies,surface brightness)
http://en.wikipedia.org/wiki/De_Vaucouleurs%27_law

Referenced by:
Sérsic profile

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