Shape, Colour, and Distance in Weak Gravitational Flexion

Canonically, elliptical galaxies might be expected to have a perfectrotational symmetry, making them ideal targets for flexion studies - however,this assumption hasn't been tested. We have undertaken an analysis of low andhigh redshift galaxy catalogs of known morphological type with a newgravitational lensing code, Lenser. Using color measurements in the u-r bandand fit Sersic index values, objects with characteristics consistent withearly-type galaxies are found to have a lower intrinsic scatter in flexionsignal than late-type galaxies. We find this measured flexion noise can bereduced by more than a factor of two at both low and high redshift.