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Paola Oliva-Altamirano edited section_Previous_measurements_citet_JIMMY13__.tex
almost 9 years ago
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where $R$ represents the radius of the galaxy, V is the stellar velocity and $\sigma$ the velocity dispersion. The numerator and denominator are luminosity weighted. A higher $\lambda_{\rm R}$ represents a higher angular momentum. \textbf{The ellipticity ($\epsilon$)} at the effective radius of each galaxy was measured using the publicly available IDL routine $find\_galaxy.pro$ developed
by Michele Cappellari\footnote{http://www-astro.physics.ox.ac.uk/$\sim$mxc/idl/}. Following \citet{EMSELLEM11}, the values of $\lambda_{\rm R}$ and $\epsilon$ can be used to distinguish fast and slow rotators (FR and SR respectively) by using the threshold:
\begin{equation}
\label{eq:FR}
\lambda_{\rm R} \geq (0.31 \pm 0.01)\times \sqrt{\epsilon},
\end{equation}