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A gravitational lensing detection of filamentary structures connecting luminous red galaxies

Xia, Q, Robertson, N, Heymans, C, Amon, A, Asgari, M, Cai, Y-C, Erben, T, Harnois-Déraps, J, Hildebrandt, H, Kannawadi, A, Kuijken, K, Schneider, P, Sifón, C, Tröster, T and Wright, AH (2020) A gravitational lensing detection of filamentary structures connecting luminous red galaxies. Astronomy and Astrophysics, 633. ISSN 0004-6361

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Date Deposited: 22 Jul 2020 08:35
Last Modified: 22 Jul 2020 08:45
DOI or Identification number: 10.1051/0004-6361/201936678
URI: https://researchonline.ljmu.ac.uk/id/eprint/13333

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