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We investigate the contentious issue of the presence, or lack thereof, ofsatellites mass segregation in galaxy groups using the Galaxy And Mass Assembly(GAMA) survey, the GALFORM semi-analytic and the EAGLE cosmologicalhydrodynamical simulation catalogues of galaxy groups. We select groups withhalo mass $12 \leqslant \log(M_{\text{halo}}/h^{-1}M_\odot) <14.5$ and redshift$z \leqslant 0.32$ and probe the radial distribution of stellar mass out totwice the group virial radius. All the samples are carefully constructed to becomplete in stellar mass at each redshift range and efforts are made toregularise the analysis for all the data. Our study shows negligible masssegregation in galaxy group environments with absolute gradients of$\lesssim0.08$ dex and also shows a lack of any redshift evolution. Moreover,we find that our results at least for the GAMA data are robust to differenthalo mass and group centre estimates. Furthermore, the EAGLE data allows us toprobe much fainter luminosities ($r$-band magnitude of 22) as well asinvestigate the three-dimensional spatial distribution with intrinsic haloproperties, beyond what the current observational data can offer. In both caseswe find that the fainter EAGLE data show a very mild spatial mass segregationat $z \leqslant 0.22$, which is again not apparent at higher redshift.Interestingly, our results are in contrast to some earlier findings using theSloan Digital Sky Survey. We investigate the source of the disagreement andsuggest that subtle differences between the group finding algorithms could bethe root cause.

monthly notices of the royal astronomical society

Galaxy And Mass Assembly (GAMA): The absence of stellar mass segregation  in galaxy groups and consistent predictions from GALFORM and EAGLE  simulations