Q2237+030

Z (lens) V (max) Re Sigma (ap) Aperture Sigma (Re/8) Reference
0.039
- -
215(30)km/s 0.7"x4"
-
Foltz et al. 1992, ApJ, 386, L43

Z = redshift
V (max) = maximum of the rotation curve
Re = half light radius (effective radius)
Sigma (ap) = velocity dispersion as measured with the spectroscopic aperture
Aperture = size of the spectroscopic aperture
Sigma (Re/8) = central velocity dispersion, i.e. corrected to an effective circular aperture of radius Re/8