The dark matter environment of the Abell 901/902 supercluster: a weak lensing analysis of the HST STAGES survey |
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| Authors: | 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 Bö hm,John A. R. Caldwell,Boris Hä uß ler,Knud Jahnke,Shardha Jogee,Eelco van Kampen,Kyle Lane,Daniel H. McIntosh,Klaus Meisenheimer,Yannick Mellier,Sebastian F. Sá nchez,y N. Taylor,Lutz Wisotzki, Xianzhong Zheng |
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| Affiliation: | Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, Canada V6T 1Z1;Institut d'Astrophysique de Paris, UMR7095 CNRS, 98 bis bd Arago, 75014 Paris, France;School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD;NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, Canada V9E 2E7;Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA;Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany;Department of Astrophysics, Denys Wilkinson Building, University of Oxford, Keble Road, Oxford OX1 3RH;Institute of Cosmology and Gravitation, University of Portsmouth, Hampshire Terrace, Portsmouth PO1 2EG;Department of Physics and Astronomy, University Of Waterloo, Waterloo, Ontario, Canada N2L 3G1;Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, CH-1290 Sauverny, Switzerland;Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25/8, A-6020 Innsbruck, Austria;Astrophysikalisches Insitut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany;University of Texas, McDonald Observatory, Fort Davis, TX 79734, USA;Department of Astronomy, University of Texas at Austin, 1 University Station, C1400 Austin, TX 78712-0259, USA;Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA;Centro Hispano Aleman de Calar Alto, C/Jesus Durban Remon 2-2, E-04004 Almeria, Spain;The Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Purple Mountain Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | 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 901α. 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'. |
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| Keywords: | galaxies: cluster cosmology: observations dark matter large-scale structure of Universe |
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