CFHTLenS: weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2015

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

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Tim Schrabback
  • Function : Author
Stefan Hilbert
  • Function : Author
Henk Hoekstra
  • Function : Author
Patrick Simon
  • Function : Author
  • PersonId : 758140
  • IdRef : 204200636
Edo van Uitert
  • Function : Author
Thomas Erben
  • Function : Author
Catherine Heymans
  • Function : Author
Hendrik Hildebrandt
  • Function : Author
Thomas D. Kitching
  • Function : Author
Lance Miller
  • Function : Author
Ludovic van Waerbeke
  • Function : Author
Philip Bett
  • Function : Author
Jean Coupon
  • Function : Author
Liping Fu
  • Function : Author
Michael J. Hudson
  • Function : Author
Benjamin Joachimi
  • Function : Author
Martin Kilbinger
Konrad Kuijken
  • Function : Author

Abstract

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_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.
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Dates and versions

insu-03644673 , version 1 (25-04-2022)

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Tim Schrabback, Stefan Hilbert, Henk Hoekstra, Patrick Simon, Edo van Uitert, et al.. CFHTLenS: weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment. Monthly Notices of the Royal Astronomical Society, 2015, 454, pp.1432-1452. ⟨10.1093/mnras/stv2053⟩. ⟨insu-03644673⟩
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