Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 deg2 of KiDS weak lensing data
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Galaxies and their dark matter 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 dark matter haloes and the galaxies they host, we aim to study the effect of these cosmic environments on the average mass of galactic haloes. To this end we measure the galaxy-galaxy lensing profile of 91 195 galaxies, within 0.039 < z <0.263, from the spectroscopic Galaxy And Mass Assembly survey, using ~100 deg2 of overlapping data from the Kilo-Degree Survey. In each of the four cosmic environments we model the contributions from group centrals, satellites and neighbouring groups to the stacked galaxy-galaxy lensing profiles. After correcting the lens samples for differences in the stellar mass distribution, we find no dependence of the average halo mass of central galaxies on their cosmic environment. We do find a significant increase in the average contribution of neighbouring groups to the lensing profile in increasingly dense cosmic environments. We show, however, that the observed effect can be entirely attributed to the galaxy density at much smaller scales (within 4 h-1 Mpc), which is correlated with the density of the cosmic environments. Within our current uncertainties we find no direct dependence of galaxy halo mass on their cosmic environment.
Brouwer , M M , Cacciato , M , Dvornik , A , Eardley , L , Heymans , C , Hoekstra , H , Kuijken , K , McNaught-Roberts , T , Sifón , C , Viola , M , Alpaslan , M , Bilicki , M , Bland-Hawthorn , J , Brough , S , Choi , A , Driver , S P , Erben , T , Grado , A , Hildebrandt , H , Holwerda , B W , Hopkins , A M , de Jong , J T A , Liske , J , McFarland , J , Nakajima , R , Napolitano , N R , Norberg , P , Peacock , J A , Radovich , M , Robotham , A S G , Schneider , P , Sikkema , G , van Uitert , E , Kleijn , G V & Valentijn , E A 2016 , ' Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 deg 2 of KiDS weak lensing data ' Monthly Notices of the Royal Astronomical Society , vol. 462 , no. 4 , pp. 4451-4463 . https://doi.org/10.1093/mnras/stw1602
Monthly Notices of the Royal Astronomical Society
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1093/mnras/stw1602
DescriptionCH, MV, MC, HHo, CS and AC acknowledge support from the European Research Council under FP7 grant number 279396 (MV, MC, CS, HHo), grant number 240185 (AC and CH) and grant number G47112 (CH). MV acknowledges support from the Netherlands Organisation for Scientific Research (NWO) through grants 614.001.103. HHi is supported by an Emmy Noether grant (No. Hi 1495/2-1) of the Deutsche Forschungsgemeinschaft. RN acknowledges support from the German Federal Ministry for Economic Affairs and Energy (BMWi) provided via DLR under project no. 50QE1103. TM-R and PN acknowledge support from an European Research Council Starting Grant (DEGAS-259586). This work is supported by the Deutsche Forschungsgemeinschaft in the framework of the TR33 ‘The Dark Universe’. GVK acknowledges financial support from the Netherlands Research School for Astronomy (NOVA) and Target. Target is supported by Samenwerkingsverband Noord Nederland, European fund for regional development, Dutch Ministry of economic affairs, Pieken in de Delta, Provinces of Groningen and Drenthe. EvU acknowledges support from an STFC Ernest Rutherford Research Grant, grant reference ST/L00285X/1.
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