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

12 Scopus citations


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.

Original languageEnglish (US)
Article numberA89
JournalAstronomy and Astrophysics
StatePublished - Jan 1 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmology: observations
  • Dark matter
  • Gravitational lensing: weak
  • Large-scale structure of Universe


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