Volume 633, January 2020
|Number of page(s)||12|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 January 2020|
A gravitational lensing detection of filamentary structures connecting luminous red galaxies
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
2 Department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
3 German Centre for Cosmological Lensing, Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstr, Bochum, Germany
4 Kavli Institute for Particle Astrophysics & Cosmology, Stanford University, PO Box 2450, Stanford, CA 94305, USA
5 Argelander-Institut für Astronomie, Universitẗ Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
6 Leiden Observatory, Leiden University, PO Box 9513, 2300 Leiden, The Netherlands
7 Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla, 4059 Valparaíso, Chile
Accepted: 26 November 2019
We present a weak lensing detection of filamentary structures in the cosmic web, combining data from the Kilo-Degree Survey, the Red Cluster Sequence Lensing Survey, and the Canada-France-Hawaii Telescope Lensing Survey. The line connecting luminous red galaxies with a separation of 3 − 5 h−1 Mpc was chosen as a proxy for the location of filaments. We measured the average weak lensing shear around ∼11 000 candidate filaments selected in this way from the Sloan Digital Sky Survey. After nulling the shear induced by the dark matter haloes around each galaxy, we reported a 3.4σ detection of an anisotropic shear signal from the matter that connects them. Adopting a filament density profile, motivated from N-body simulations, the average density at the centre of these filamentary structures was found to be 15 ± 4 times the critical density.
Key words: gravitational lensing: weak / large-scale structure of Universe / dark matter / cosmology: observations
© ESO 2020
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