A gravitational lensing detection of filamentary structures connecting luminous red galaxies

Qianli Xia, Naomi Robertson, Catherine Heymans, Alexandra Amon, Marika Asgari, Yan-Chuan Cai, Thomas Erben, Joachim Harnois-Déraps, Hendrik Hildebrandt, Arun Kannawadi, Konrad Kuijken, Peter Schneider, Cristóbal Sifón, Tilman Tröster, Angus H. Wright

Research output: Contribution to journalArticlepeer-review


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 3−5h−1Mpc is chosen as a proxy for the location of filaments. We measure 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 report 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 is found to be 15±4 times the critical density.
Original languageEnglish
Article numberA89
Number of pages12
JournalAstronomy & Astrophysics
Publication statusPublished - 15 Jan 2020


  • astro-ph.CO


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