Galaxy And Mass Assembly: Estimating galaxy group masses via caustic
  analysis
  We have generated complementary halo mass estimates for all groups in the
Galaxy And Mass Assembly Galaxy Group Catalogue (GAMA G3Cv1) using a modified
caustic mass estimation algorithm, originally developed by Diaferio & Geller
(1997). We calibrate the algorithm by applying it on a series of 9 GAMA mock
galaxy light cones and investigate the effects of using different definitions
for group centre and size. We select the set of parameters that provide
median-unbiased mass estimates when tested on mocks, and generate mass
estimates for the real group catalogue. We find that on average, the caustic
mass estimates agree with dynamical mass estimates within a factor of 2 in 90.8
+/- 6.1% groups and compares equally well to velocity dispersion based mass
estimates for both high and low multiplicity groups over the full range of
masses probed by the G3Cv1.
