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Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 deg(2) of KiDS weak lensing data

Brouwer, MM; Cacciato, M; Dvornik, A; Eardley, L; Heymans, C; Hoekstra, H; Kuijken, K; ... Valentijn, EA; + view all (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 , 462 (4) pp. 4451-4463. 10.1093/mnras/stw1602. Green open access

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Abstract

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 ∼100deg2 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.

Type: Article
Title: Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 deg(2) of KiDS weak lensing data
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stw1602
Publisher version: http://dx.doi.org/10.1093/mnras/stw1602
Language: English
Additional information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Science & technology, physical sciences, astronomy & astrophysics, gravitational lensing: weak, methods: statistical, surveys, galaxies: haloes, dark matter, large-scale structure of universe, dark-matter haloes, digital sky survey, assembly gama, stellar mass, data release, photometric redshifts, luminosity function, square degrees, evolution, CFHTlens
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1529356
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