@article{602c29ec5a8643159159ca6459f76320,
title = "The CFHT large area U-band deep survey (CLAUDS)",
abstract = "The Canada–France–Hawaii Telescope (CFHT) Large Area U-band Deep Survey (CLAUDS) uses data taken with the MegaCam mosaic imager on CFHT to produce images of 18.60 deg2 with median seeing of FWHM = 0.92 arcsec and to a median depth of U = 27.1 AB (5σ in 2 arcsec apertures), with selected areas that total 1.36 deg2 reaching a median depth of U = 27.7 AB. These are the deepest U-band images assembled to date over this large an area. These data are located in four fields also imaged to comparably faint levels in grizy and several narrowband filters as part of the Hyper Suprime–Cam (HSC) Subaru Strategic Program (HSC-SSP). These CFHT and Subaru data sets will remain unmatched in their combination of area and depth until the advent of the Large Synoptic Survey Telescope. This paper provides an overview of the scientific motivation for CLAUDS and gives details of the observing strategy, observations, data reduction, and data merging with the HSC-SSP. Three early applications of these deep data are used to illustrate the potential of the data set: deep U-band galaxy number counts, z ∼ 3 Lyman break galaxy selection, and photometric redshifts improved by adding CLAUDS U to the Subaru HSC grizy photometry.",
keywords = "Cosmology: observations, Dark matter, Galaxies: formation, Galaxies: haloes, Galaxies: statistics, Large-scale structure of universe",
author = "Marcin Sawicki and Stephane Arnouts and Jiasheng Huang and Jean Coupon and Anneya Golob and Stephen Gwyn and Sebastien Foucaud and Thibaud Moutard and Ikuru Iwata and Chengze Liu and Lingjian Chen and Guillaume Desprez and Yuichi Harikane and Yoshiaki Ono and Strauss, {Michael A.} and Masayuki Tanaka and Nathalie Thibert and Michael Balogh and Kevin Bundy and Scott Chapman and Gunn, {James E.} and Hsieh, {Bau Ching} and Olivier Ilbert and Yipeng Jing and Olivier LeF{\`e}vre and Cheng Li and Yuichi Matsuda and Satoshi Miyazaki and Tohru Nagao and Nishizawa, {Atsushi J.} and Masami Ouchi and Kazuhiro Shimasaku and John Silverman and {De la Torre}, Sylvain and Laurence Tresse and Wang, {Wei Hao} and Willott, {Chris J.} and Toru Yamada and Xiaohu Yang and Yee, {Howard K.C.}",
note = "Funding Information: This work is also based in part on data collected at the Subaru Telescope and retrieved from the HSC data archive system, which is operated by the Subaru Telescope and Astronomy Data Center at National Astronomical Observatory of Japan. The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by the National Astronomical Observatory of Japan (NAOJ), the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University. This paper makes use of software developed for the Large Synoptic Survey Telescope. We thank the LSST Project for making their code available as free software at http://dm.lsst.org. Funding Information: Compute Canada and Canadian Advanced Network For Astrophysical Research (CANFAR) infrastructure. We are grateful for research support funding from the Natural Sciences and Engineering Research Council (NSERC) of Canada. This work was also supported by the Programme National Cosmologie et Galaxies (PCNG) co-funded by the Commisariat a l{\textquoteright}Energie Atomique (CEA) and Centre National d{\textquoteright}Etudes Spatiales CNES). Funding Information: 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{\textquoteright}Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories, Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. This work uses data products from TERAPIX and the Canadian Astronomy Data Centre. It was carried out using resources from Funding Information: We thank the CFHT observatory staff for their hard work in obtaining these data. The observations presented here were performed with care and respect from the summit of Maunakea which is a significant cultural and historic site. We also thank the expert anonymous referee who suggested a number of important details to be included in the paper. 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{\textquoteright}Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories, Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. This work uses data products from TERAPIX and the Canadian Astronomy Data Centre. It was carried out using resources from Compute Canada and Canadian Advanced Network For Astrophysical Research (CANFAR) infrastructure. We are grateful for research support funding from the Natural Sciences and Engineering Research Council (NSERC) of Canada. This work was also supported by the Programme National Cosmologie et Galaxies (PCNG) co-funded by the Commisariat a l{\textquoteright}Energie Atomique (CEA) and Centre National d{\textquoteright}Etudes Spatiales CNES). This work is also based in part on data collected at the Subaru Telescope and retrieved from the HSC data archive system, which is operated by the Subaru Telescope and Astronomy Data Center at National Astronomical Observatory of Japan. The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by the National Astronomical Observatory of Japan (NAOJ), the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University. This paper makes use of software developed for the Large Synoptic Survey Telescope. We thank the LSST Project for making their code available as free software at http://dm.lsst.org. During the course of this work, we have made use of the cosmological calculator of Wright (2006). Publisher Copyright: {\textcopyright} 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2019",
doi = "10.1093/mnras/stz2522",
language = "English (US)",
volume = "489",
pages = "5202--5217",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",
}