1604.07233
Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 square degrees of KiDS weak lensing data
Brouwer, Cacciato, et al
Galaxies and their DM haloes are part of a complex network of mass structures, collectively called the cosmic web. Using the tidal tensor prescription these structures can be classified into four cosmic environments: voids, sheets, filaments and knots. As the cosmic web may influence the formation and evolution of DM haloes and the galaxies they host, aim to study the effect of these cosmic environments on the average mass of galactic haloes. To this end, measure the gg lensing profile of 91,195 galaxies, within 0.039<z<0.263, from the spectroscopic GAMA survey, using ~100 square degrees of overlapping data form KiDS. In each of the 4 cosmic environments, model the contributions from group centrals, satellites and neighboring groups to the stacked gg lensing profiles. After correcting the lens samples for differences in the stellar mass distirbuitons, find no dependence of the average halo mass of central galaxies in their cosmic environment. Find a significant increase in the average contribution of neighboring groups to the lensing profile in increasingly dense cosmic environments. Show, however, that the observed effect can be entirely attributed to the galaxy density at much smaller scales (within 4 Mpc/h), which is correlated with the density of the cosmic environments. Within the current uncertainties, find no direct dependence of galaxy halo mass on their cosmic environment.
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