The shape of dark matter haloes: results from weak lensing in the ultraviolet near-infrared optical Northern survey (UNIONS)

Author:

Robison Bailey12,Hudson Michael J123ORCID,Cuillandre Jean-Charles4ORCID,Erben Thomas5,Fabbro Sébastien6,Gavazzi Raphaël78,Guinot Axel49,Gwyn Stephen10,Hildebrandt Hendrik11,Kilbinger Martin412,McConnachie Alan6,Miller Lance13,Spitzer Isaac12,van Waerbeke Ludovic14

Affiliation:

1. Department of Physics and Astronomy, University of Waterloo , Waterloo, ON, N2L 3G1 , Canada

2. Waterloo Centre for Astrophysics , Waterloo, ON, N2L 3G1 , Canada

3. Perimeter Institute for Theoretical Physics , 31 Caroline St. N., Waterloo, ON, N2L 2Y5 , Canada

4. AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris , F-91191 Gif-sur-Yvette , France

5. Argelander-Institut für Astronomie , Auf dem Hügel 71, D-53121 Bonn , Germany

6. NRC Herzberg Astronomy & Astrophysics , 5071 West Saanich Road, British Columbia , Canada V9E2E7

7. Sorbonne Université, CNRS , UMR7095, Institut d’Astrophysique de Paris, F-75014 Paris , France

8. Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB30HA , UK

9. Université de Paris, CNRS, Astroparticule et Cosmologie , F-75013 Paris , France

10. Canadian Astronomy Data Centre, Herzberg Astronomy and Astrophysics, National Research Council , 5071 West Saanich Rd, Victoria BC, V9E 2E7 , Canada

11. Ruhr-UniversFF-ität Bochum, Astronomisches Institut, German Centre for Cosmological Lensing (GCCL) , Universitätsstr. 150, D-44801 Bochum , Germany

12. Institut d’Astrophysique de Paris , UMR7095 CNRS, Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris , France

13. Department of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH , UK

14. Department of Physics and Astronomy, University of British Columbia , 6224 Agricultural road, Vancouver, BC V6T 1Z1 , Canada

Abstract

ABSTRACT Cold dark matter haloes are expected to be triaxial and so appear elliptical in projection. We use weak gravitational lensing from the Canada–France Imaging Survey (CFIS) component of the Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) to measure the ellipticity of the dark matter haloes around Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey Data Release 7 (DR7) and from the CMASS and LOWZ samples of the Baryon Oscillation Spectroscopic Survey (BOSS), assuming their major axes are aligned with the stellar light. We find that DR7 LRGs with masses M ∼ 2.7 × 1013 M⊙ h−1 have halo ellipticities e = 0.46 ± 0.10. Expressed as a fraction of the galaxy's ellipticity, we find fh = 2.2 ± 0.6. For BOSS LRGs, the detection is of marginal significance: e = 0.20 ± 0.10 and fh = 0.7 ± 0.7. These results are in agreement with other measurements of halo ellipticity from weak lensing and, taken together with previous results, suggest an increase in halo ellipticity of 0.10 ± 0.06 per decade in halo mass. This trend agrees with the predictions from hydrodynamical simulations, which find that at higher halo masses, not only do dark matter haloes become more elliptical, but that the misalignment between the major axis of the stellar light in the central galaxy and that of the dark matter decreases.

Funder

Natural Sciences and Engineering Research Council of Canada

German Research Foundation

European Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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