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CFHTLenS: weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment

Schrabback, Tim ; Hilbert, Stefan ; Hoekstra, Henk ; Simon, Patrick ; van Uitert, Edo ; Erben, Thomas ; Heymans, Catherine ; Hildebrandt, Hendrik ; Kitching, Thomas D. ; Mellier, Yannick ; Miller, Lance ; Van Waerbeke, Ludovic ; Bett, Philip ; Coupon, Jean ; Fu, Liping ; Hudson, Michael J. ; Joachimi, Benjamin ; Kilbinger, Martin ; Kuijken, Konrad

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 454, no. 2, p. 1432-1452

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    Titel
    • CFHTLenS: weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment
    Autor
    • Schrabback, Tim. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • Hilbert, Stefan. Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany
    • Hoekstra, Henk. Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands
    • Simon, Patrick. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • van Uitert, Edo. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • Erben, Thomas. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • Heymans, Catherine. The Scottish Universities Physics Alliance, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
    • Hildebrandt, Hendrik. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • Kitching, Thomas D.. Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
    • Mellier, Yannick. Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
    • Miller, Lance. Department of Physics, Oxford University, Keble Road, Oxford OX1 3RH, UK
    • Van Waerbeke, Ludovic. Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Rd, Vancouver, BC V6T 1Z1, Canada
    • Bett, Philip. Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
    • Coupon, Jean. Astronomical Observatory of the University of Geneva, ch. d'Ecogia 16, CH-1290 Versoix, Switzerland
    • Fu, Liping. Shanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, 200234 Shanghai, China
    • Hudson, Michael J.. Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
    • Joachimi, Benjamin. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
    • Kilbinger, Martin. Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
    • Kuijken, Konrad. Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 454, no. 2, p. 1432-1452. Oxford University Press
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:291210
    Summary
    We present weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment. Using data from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), we measure the weighted-average ratio of the aligned projected ellipticity components of galaxy matter haloes and their embedded galaxies, fh, split by galaxy type. We then compare our observations to measurements taken from the Millennium Simulation, assuming different models of galaxy-halo misalignment. Using the Millennium Simulation, we verify that the statistical estimator used removes contamination from cosmic shear. We also detect an additional signal in the simulation, which we interpret as the impact of intrinsic shape-shear alignments between the lenses and their large-scale structure environment. These alignments are likely to have caused some of the previous observational constraints on fh to be biased high. From CFHTLenS, we find fh=−0.04±0.25 for early-type galaxies, which is consistent with current models for the galaxy-halo misalignment predicting fh ≃ 0.20. For late-type galaxies we measure $f_\mathrm{h}=0.69_{-0.36}^{+0.37}$ from CFHTLenS. This can be compared to the simulated results which yield fh ≃ 0.02 for misaligned late-type models