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Published August 2013 | Submitted + Supplemental Material + Published
Journal Article Open

CFHTLenS: the Canada–France–Hawaii Telescope Lensing Survey – imaging data and catalogue products

Abstract

We present data products from the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS). CFHTLenS is based on the Wide component of the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS). It encompasses 154 deg^2 of deep, optical, high-quality, sub-arcsecond imaging data in the five optical filters u*g′r′i′z′. The scientific aims of the CFHTLenS team are weak gravitational lensing studies supported by photometric redshift estimates for the galaxies. This paper presents our data processing of the complete CFHTLenS data set. We were able to obtain a data set with very good image quality and high-quality astrometric and photometric calibration. Our external astrometric accuracy is between 60 and 70 mas with respect to Sloan Digital Sky Survey (SDSS) data, and the internal alignment in all filters is around 30 mas. Our average photometric calibration shows a dispersion of the order of 0.01–0.03 mag for g′r′i′z′ and about 0.04 mag for u* with respect to SDSS sources down to i_(SDSS) ≤ 21. We demonstrate in accompanying papers that our data meet necessary requirements to fully exploit the survey for weak gravitational lensing analyses in connection with photometric redshift studies. In the spirit of the CFHTLS, all our data products are released to the astronomical community via the Canadian Astronomy Data Centre at http://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/community/CFHTLens/query.html. We give a description and how-to manuals of the public products which include image pixel data, source catalogues with photometric redshift estimates and all relevant quantities to perform weak lensing studies.

Additional Information

© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 May 23. Received 2013 May 23; in original form 2012 October 30. First published online: June 18, 2013. We thank the VIPERS collaboration, for a fruitful data exchange and for providing us with unpublished spectroscopic redshifts. We also thank TERAPIX for the individual exposure quality assessment and validation during the CFHTLS data acquisition period, and Emmanuel Bertin for developing key software modules used in this study. CFHTLenS data processing was made possible thanks to significant computing support from the NSERC Research Tools and Instruments grant programme. We thank the CFHT staff for successfully conducting the CFHTLS observations and in particular Jean-Charles Cuillandre and Eugene Magnier for the continuous improvement of the instrument calibration and the ELIXIR detrended data that we used. 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 Sciences de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France and the University of Hawaii. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency. TE is supported by the Deutsche Forschungsgemeinschaft through project ER 327/3-1 and the Transregional Collaborative Research Centre TR 33 – 'The Dark Universe'. HH is supported by the Marie Curie IOF 252760, a CITA National Fellowship and the DFG grant Hi 1495/2-1. LVW acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Institute for Advanced Research (CIfAR, Cosmology and Gravity programme). CH acknowledges support from the European Research Council under the EC FP7 grant number 240185. HH acknowledges support from Marie Curie IRG grant 230924, the Netherlands Organisation for Scientific Research (NWO) grant number 639.042.814 and from the European Research Council under the EC FP7 grant number 279396. TDK acknowledges support from a Royal Society University Research Fellowship. YM acknowledges support from CNRS/Institut National des Sciences de l'Univers (INSU) and the Programme National Galaxies et Cosmologie (PNCG). CB is supported by the Spanish Science Ministry AYA2009-13936 Consolider- Ingenio CSD2007-00060, project 2009SGR1398 from Generalitat de Catalunya and by the European Commissions Marie Curie Initial Training Network CosmoComp (PITN-GA-2009-238356). LF acknowledges support from NSFC grants 11103012 and 10878003, Innovation Program 12ZZ134 and Chen Guang project 10CG46 of SMEC, and STCSM grant 11290706600. KH acknowledges support from a doctoral fellowship awarded by the Research council of Norway, project number 177254/V30. MJH acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC). MK is supported in parts by the DFG cluster of excellence 'Origin and Structure of the Universe'. BR acknowledges support from the European Research Council in the form of a Starting Grant with number 24067. TS acknowledges support from NSF through grant AST-0444059-001, SAO through grant GO0-11147A and NWO. ES acknowledges support from the Netherlands Organisation for Scientific Research (NWO) grant number 639.042.814 and support from the European Research Council under the EC FP7 grant number 279396. PS is supported by the Deutsche Forschungsgemeinschaft through the Transregional Collaborative Research Centre TR 33 – 'The Dark Universe'. MS acknowledges support from the Netherlands Organization for Scientific Research (NWO). MV acknowledges support from the Netherlands Organization for Scientific Research (NWO) and from the Beecroft Institute for Particle Astrophysics and Cosmology. Author Contributions: All authors contributed to the development and writing of this paper. The authorship list reflects the lead authors of this paper (TE, HH, LM, LVW, CH) followed by two alphabetical groups. The first alphabetical group includes key contributors to the science analysis and interpretation in this paper, the founding core team and those whose long-term significant effort produced the final CFHTLenS data product. The second group covers members of the CFHTLenS team who made a contribution to the project and/or this paper. CH and LVW co-led the CFHTLenS collaboration.

Attached Files

Published - MNRAS-2013-Erben-2545-63.pdf

Submitted - 1210.8156v1.pdf

Supplemental Material - CFHTLenS_table.txt

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Additional details

Created:
August 22, 2023
Modified:
October 24, 2023