Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
Creators: name: Aihara, Hiroaki
name: AlSayyad, Yusra
name: Ando, Makoto
name: Armstrong, Robert
name: Bosch, James
name: Egami, Eiichi
name: Furusawa, Hisanori
name: Furusawa, Junko
name: Goulding, Andy
name: Harikane, Yuichi
name: Hikage, Chiaki
name: Ho, Paul T. P.
name: Hsieh, Bau-Ching
name: Huang, Song
name: Ikeda, Hiroyuki
name: Imanishi, Masatoshi
name: Ito, Kei
name: Iwata, Ikuru
name: Jaelani, Anton T.
name: Kakuma, Ryota
name: Kawana, Kojiro
name: Kikuta, Satoshi
name: Kobayashi, Umi
name: Koike, Michitaro
name: Komiyama, Yutaka
name: Li, Xiangchong
name: Liang, Yongming
name: Lin, Yen-Ting
name: Luo, Wentao
name: Lupton, Robert
name: Lust, Nate B.
name: MacArthur, Lauren A.
name: Matsuoka, Yoshiki
name: Mineo, Sogo
name: Miyatake, Hironao
name: Miyazaki, Satoshi
name: More, Surhud
name: Murata, Ryoma
name: Namiki, Shigeru V.
name: Nishizawa, Atsushi J.
name: Oguri, Masamune
name: Okabe, Nobuhiro
name: Okamoto, Sakurako
name: Okura, Yuki
name: Ono, Yoshiaki
name: Onodera, Masato
name: Onoue, Masafusa
name: Osato, Ken
name: Ouchi, Masami
name: Shibuya, Takatoshi
name: Strauss, Michael A.
name: Sugiyama, Naoshi
name: Suto, Yasushi
name: Takada, Masahiro
name: Takagi, Yuhei
name: Takata, Tadafumi
name: Takita, Satoshi
name: Tanaka, Masayuki
name: Terai, Tsuyoshi
name: Toba, Yoshiki
name: Uchiyama, Hisakazu
name: Utsumi, Yousuke
name: Wang, Shiang-Yu
name: Wang, Wenting
name: Yamada, Yoshihiko
Publisher: name: arXiv
Year: 2019
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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/.
description: 26 pages, 23 figures, accepted for publication in PASJ. Data available at https://hsc-release.mtk.nao.ac.jp/