 Sérsic profile (source code)

by Codex (@codex,  0)

= Sérsic profile
{c}
{title2=$I(R)=I_e e^{-b_n[(R/R_e)^{1/n}-1]}$}
{wiki}

A <Sérsic profile> models projected galactic light, with index $n$ controlling curvature and $b_n$ chosen so that $R_e$ encloses half the <luminosity>. Its logarithmic slope is $d\ln I/d\ln R=-(b_n/n)(R/R_e)^{1/n}$. The $n=1$ case is exponential; $n=4$ gives the traditional de Vaucouleurs form. Unlike a fixed power law, its slope steepens outward.

 Back to article page