The dark matter environment of the Abell 901/902 supercluster: a weak lensing analysis of the HST STAGES survey

Catherine Heymans, Meghan E. Gray, Chien Y. Peng, Ludovic Van Waerbeke, Eric F. Bell, Christian Wolf, David Bacon, Michael Balogh, Fabio D. Barazza, Marco Barden, Asmus Boehm, John A. R. Caldwell, Boris Haeussler, Knud Jahnke, Shardha Jogee, Eelco van Kampen, Kyle Lane, Daniel H. McIntosh, Klaus Meisenheimer, Yannick MellierSebastian F. Sanchez, Andy N. Taylor, Lutz Wisotzki, Xianzhong Zheng

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present a high-resolution dark matter reconstruction of the z = 0.165 Abell 901/902 supercluster from a weak lensing analysis of the Hubble Space Telescope STAGES survey. We detect the four main structures of the supercluster at high significance, resolving substructure within and between the clusters. We find that the distribution of dark matter is well traced by the cluster galaxies, with the brightest cluster galaxies marking out the strongest peaks in the dark matter distribution. We also find a significant extension of the dark matter distribution of Abell 901a in the direction of an infalling X-ray group Abell 901 alpha. We present mass, mass-to-light and mass-to-stellar mass ratio measurements of the structures and substructures that we detect. We find no evidence for variation of the mass-to-light and mass-to-stellar mass ratio between the different clusters. We compare our space-based lensing analysis with an earlier ground-based lensing analysis of the supercluster to demonstrate the importance of space-based imaging for future weak lensing dark matter 'observations'.

Original languageEnglish
Pages (from-to)1431-1442
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume385
Issue number3
DOIs
Publication statusPublished - 11 Apr 2008

Keywords / Materials (for Non-textual outputs)

  • galaxies : cluster
  • cosmology : observations
  • dark matter
  • large-scale structure of Universe
  • INITIAL MASS FUNCTION
  • DIGITAL SKY SURVEY
  • STAR-FORMATION
  • STELLAR MASS
  • A901/902 SUPERCLUSTER
  • HALO CONCENTRATIONS
  • GALAXY HARASSMENT
  • COMBO-17 SURVEY
  • GEMS SURVEY
  • EVOLUTION

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