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CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments

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arxiv 1303.1808 v1 pith:EKFY3GHB submitted 2013-03-07 astro-ph.CO

Catherine Heymans , Emma Grocutt , Alan Heavens , Martin Kilbinger , Thomas D. Kitching , Fergus Simpson , Jonathan Benjamin , Thomas Erben
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Hendrik Hildebrandt Henk Hoekstra Yannick Mellier Lance Miller Ludovic Van Waerbeke Michael L. Brown Jean Coupon Liping Fu Joachim Harnois-Deraps Michael J. Hudson Konrad Kuijken Barnaby Rowe Tim Schrabback Elisabetta Semboloni Sanaz Vafaei Malin Velander
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keywords intrinsicalignmentcfhtlensgalaxyconstraintscosmologicaldatalensing
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We present a finely-binned tomographic weak lensing analysis of the Canada-France-Hawaii Telescope Lensing Survey, CFHTLenS, mitigating contamination to the signal from the presence of intrinsic galaxy alignments via the simultaneous fit of a cosmological model and an intrinsic alignment model. CFHTLenS spans 154 square degrees in five optical bands, with accurate shear and photometric redshifts for a galaxy sample with a median redshift of zm =0.70. We estimate the 21 sets of cosmic shear correlation functions associated with six redshift bins, each spanning the angular range of 1.5<theta<35 arcmin. We combine this CFHTLenS data with auxiliary cosmological probes: the cosmic microwave background with data from WMAP7, baryon acoustic oscillations with data from BOSS, and a prior on the Hubble constant from the HST distance ladder. This leads to constraints on the normalisation of the matter power spectrum sigma_8 = 0.799 +/- 0.015 and the matter density parameter Omega_m = 0.271 +/- 0.010 for a flat Lambda CDM cosmology. For a flat wCDM cosmology we constrain the dark energy equation of state parameter w = -1.02 +/- 0.09. We also provide constraints for curved Lambda CDM and wCDM cosmologies. We find the intrinsic alignment contamination to be galaxy-type dependent with a significant intrinsic alignment signal found for early-type galaxies, in contrast to the late-type galaxy sample for which the intrinsic alignment signal is found to be consistent with zero.

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