Shan, Huan Yuan and Kneib, Jean-Paul and Tao, Charling and Fan, Zuhui and Jauzac, Mathilde and Limousin, Marceau and Massey, Richard and Rhodes, Jason and Thanjavur, Karun and McCracken, Henry J. (2012) Weak Lensing Measurement of Galaxy Clusters in the CFHTLS-Wide Survey. Astrophysical Journal, 748 (1). Art. No. 56. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20120418-105745249
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We present the first weak gravitational lensing analysis of the completed Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We study the 64 deg^2 W1 field, the largest of the CFHTLS-Wide survey fields, and present the largest contiguous weak lensing convergence "mass map" yet made. 2.66 million galaxy shapes are measured, using the Kaiser Squires and Broadhurst Method (KSB) pipeline verified against high-resolution Hubble Space Telescope imaging that covers part of the CFHTLS. Our i'-band measurements are also consistent with an analysis of independent r'-band imaging. The reconstructed lensing convergence map contains 301 peaks with signal-to-noise ratio ν > 3.5, consistent with predictions of a ΛCDM model. Of these peaks, 126 lie within 3farcm0 of a brightest central galaxy identified from multicolor optical imaging in an independent, red sequence survey. We also identify seven counterparts for massive clusters previously seen in X-ray emission within 6 deg^2 XMM-LSS survey. With photometric redshift estimates for the source galaxies, we use a tomographic lensing method to fit the redshift and mass of each convergence peak. Matching these to the optical observations, we confirm 85 groups/clusters with χ^2_(reduced) < 3.0, at a mean redshift (z_c) = 0.36 and velocity dispersion (σ_c) = 658.8 km s^(–1). Future surveys, such as DES, LSST, KDUST, and EUCLID, will be able to apply these techniques to map clusters in much larger volumes and thus tightly constrain cosmological models.
|Additional Information:||© 2012 American Astronomical Society. Received 2011 August 9; accepted 2012 January 3; published 2012 March 6. The authors thank Bernard Fort, Liping Fu, Bo Qin, Catherine Heymans, and Ludovic Van Waerbeke for useful discussions. H.Y.S. acknowledges support from the Sino French laboratories FCPPL and Origins, and CPPM hospitality during stays in France. H.Y.S. acknowledges the support from NSFC of China under grants 11103011 and China Postdoctoral Science Foundation. J.P.K. acknowledges supports from CNRS as well as PNCG and CNES. Z.H.F. acknowledges the support from NSFC of China under grants 10773001, 11033005, and 973 program 2007CB815401. M.L. acknowledges the Centre National de la Recherche Scientifique (CNRS) for its support. The Dark Cosmology Centre is funded by the Danish National Research Foundation. This work is based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada–France–Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada–France–Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. This work also uses observations obtained with the Hubble Space Telescope. The HST COSMOS Treasury program was supported by the NASA grant HST-GO-09822. We thank Tony Roman, Denise Taylor, and David Soderblom for their assistance in planning and scheduling the extensive COSMOS observations. We thank the NASA IPAC/IRSA staff (Anastasia Laity, Anastasia Alexov, Bruce Berriman, and John Good) for providing online archive and server capabilities for the COSMOS data sets. It is also our pleasure to gratefully acknowledge the contributions of the entire COSMOS collaboration, consisting of more than 70 scientists. More information on the COSMOS survey is available at http://www.astro.caltech.edu/cosmos.|
|Subject Keywords:||cosmology: observations; galaxies: clusters: general; gravitational lensing: weak; X-rays: galaxies: clusters|
|Official Citation:||Weak Lensing Measurement of Galaxy Clusters in the CFHTLS-Wide Survey HuanYuan Shan et al. 2012 ApJ 748 56|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||18 Apr 2012 18:22|
|Last Modified:||26 Dec 2012 15:04|
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