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 on the 8.2 meter Subaru Telescope. The release includes data from 174 nights of observation through January 2018. The Wide layer data cover about 300 deg^2 in all five broadband filters (grizy) to the nominal survey exposure (10min in gr and 20min in izy). Partially observed areas are also included in the release; about 1100 deg^2 is observed in at least one filter and one exposure. The median seeing in the i-band is 0.6 arcsec, demonstrating the superb image quality of the survey. The Deep (26 deg^2) and UltraDeep (4 deg^2) data are jointly processed and the UltraDeep-COSMOS field reaches an unprecedented depth of i~28 at 5 sigma for point sources. In addition to the broad-bands, 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 to 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 the 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 deg^2). All products are available at the data release site, https://hsc-release.mtk.nao.ac.jp/.
Keywords
Cite
@article{arxiv.1905.12221,
title = {Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program},
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 Paul T. P. Ho and Bau-Ching Hsieh and Song Huang and Hiroyuki Ikeda and Masatoshi Imanishi and Kei Ito and Ikuru Iwata and Anton T. Jaelani 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 Yen-Ting Lin and Wentao Luo and Robert Lupton and Nate B. Lust and Lauren A. MacArthur and Yoshiki Matsuoka and Sogo Mineo and Hironao Miyatake and Satoshi Miyazaki and Surhud More and Ryoma Murata and Shigeru V. Namiki and Atsushi J. Nishizawa 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 Michael A. Strauss 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 Shiang-Yu Wang and Wenting Wang and Yoshihiko Yamada},
journal= {arXiv preprint arXiv:1905.12221},
year = {2019}
}
Comments
26 pages, 23 figures, accepted for publication in PASJ. Data available at https://hsc-release.mtk.nao.ac.jp/