@article{1049fbb5a1c945c494110cbb75158912,
title = "Second data release of the Hyper Suprime-Cam Subaru Strategic Program",
abstract = "This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey using the 8.2 m Subaru Telescope. The release includes data from 174 nights of observation through 2018 January. The Wide layer data cover about 300 deg2 in all five broad-band filters (grizy) to the nominal survey exposure (10 min in gr and 20 min in izy). Partially observed areas are also included in the release; about 1100 deg2 is observed in at least one filter and one exposure. The median seeing in the i-band is 0.''6, demonstrating the superb image quality of the survey. The Deep (26 deg2) and UltraDeep (4 deg2) data are jointly processed and the UltraDeep-COSMOS field reaches an unprecedented depth of i ∼ 28 at 5 σ for point sources. In addition to the broad-band data, narrow-band data are also available in the Deep and UltraDeep fields. This release includes a major update to the processing pipeline, including improved sky subtraction, PSF modeling, object detection, and artifact rejection. The overall data quality has been improved, but this release is not without problems; there is a persistent deblender problem as well as new issues with masks around bright stars. The user is encouraged to review the issue list before utilizing the data for scientific explorations. All the image products as well as catalog products are available for download. The catalogs are also loaded into a database, which provides an easy interface for users to retrieve data for objects of interest. In addition to these main data products, detailed galaxy shape measurements withheld from Public Data Release 1 (PDR1) are now available to the community. The shape catalog is drawn from the S16A internal release, which has a larger area than PDR1 (160 deg2). All products are available at the data release site, https://hsc-release.mtk.nao.ac.jp/.",
keywords = "Astronomical databases: miscellaneous, Cosmology: observations, Galaxies: general, Surveys",
author = "Hiroaki Aihara and Yusra Alsayyad and Makoto Ando and Robert Armstrong and James Bosch and Eiichi Egami and Hisanori Furusawa and Junko Furusawa and Andy Goulding and Yuichi Harikane and Chiaki Hikage and Ho, {Paul T.P.} and Hsieh, {Bau Ching} and Song Huang and Hiroyuki Ikeda and Masatoshi Imanishi and Kei Ito and Ikuru Iwata and Jaelani, {Anton T.} and Ryota Kakuma and Kojiro Kawana and Satoshi Kikuta and Umi Kobayashi and Michitaro Koike and Yutaka Komiyama and Xiangchong Li and Yongming Liang and Lin, {Yen Ting} and Wentao Luo and Robert Lupton and Lust, {Nate B.} and Macarthur, {Lauren A.} and Yoshiki Matsuoka and Sogo Mineo and Hironao Miyatake and Satoshi Miyazaki and Surhud More and Ryoma Murata and Namiki, {Shigeru V.} and Nishizawa, {Atsushi J.} and Masamune Oguri and Nobuhiro Okabe and Sakurako Okamoto and Yuki Okura and Yoshiaki Ono and Masato Onodera and Masafusa Onoue and Ken Osato and Masami Ouchi and Takatoshi Shibuya and Strauss, {Michael A.} and Naoshi Sugiyama and Yasushi Suto and Masahiro Takada and Yuhei Takagi and Tadafumi Takata and Satoshi Takita and Masayuki Tanaka and Tsuyoshi Terai and Yoshiki Toba and Hisakazu Uchiyama and Yousuke Utsumi and Wang, {Shiang Yu} and Wenting Wang and Yoshihiko Yamada",
note = "Funding Information: Sky Survey and the UKIRT Infrared Deep Sky Survey. Complementary imaging of the GAMA regions is being obtained by a number of independent survey programmes including GALEX MIS, VST KiDS, VISTA VIKING, WISE, Herschel-ATLAS, GMRT, and ASKAP, providing UV to radio coverage. GAMA is funded by the STFC (UK), the ARC (Australia), the AAO, and the participating institutions. The GAMA website is http://www.gama-survey.org/. Funding for the DEEP2 Galaxy Redshift Survey has been provided by NSF grants AST-95-09298, AST-0071048, AST-0507428, and AST-0507483, as well as NASA LTSA grant NNG04GC89G. Funding for PRIMUS is provided by NSF (AST-0607701, AST-0908246, AST-0908442, AST-0908354) and NASA (Spitzer-1356708, 08-ADP08-0019, NNX09AC95G). Funding for the DEEP3 Galaxy Redshift Survey has been provided by NSF grants AST-0808133, AST-0807630, and AST-0806732. This work is in part supported by MEXT Grant-in-Aid for Scientific Research on Innovative Areas (Nos. 15H05887, 15H05892, 15H05893). Funding Information: We thank the anonymous referee for a thoughtful report, which helped improve the paper. This work is also based on zCOSMOS observations carried out using the Very Large Telescope at the ESO Paranal Observatory under Programme ID: LP175.A-0839; on observations taken by the 3D-HST Treasury Program (GO 12177 and 12328) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555; on data from the VIMOS VLT Deep Survey, obtained from the VVDS database operated by Cesam, Lab-oratoire d{\textquoteright}Astrophysique de Marseille, France; and on data from the VIMOS Public Extragalactic Redshift Survey (VIPERS). VIPERS has been performed using the ESO Very Large Telescope, under the “Large Programme” 182.A-0886. The participating institutions and funding agencies are listed at http://vipers.inaf.it. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. GAMA is a joint European-Australasian project based around a spectroscopic campaign using the Anglo-Australian Telescope. The GAMA input catalogue is based on data taken from the Sloan Digital Funding Information: The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, the Queen{\textquoteright}s University Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation Grant No. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation. Funding Information: 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 the Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), the Japan Science and Technology Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University. Publisher Copyright: {\textcopyright} The Author(s) 2019. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.",
year = "2019",
doi = "10.1093/pasj/psz103",
language = "English (US)",
volume = "71",
journal = "Publication of the Astronomical Society of Japan",
issn = "0004-6264",
publisher = "Astronomical Society of Japan",
number = "6",
}