Third 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: Harasawa, Sumiko
name: Harikane, Yuichi
name: Hsieh, Bau-Ching
name: Ikeda, Hiroyuki
name: Ito, Kei
name: Iwata, Ikuru
name: Kodama, Tadayuki
name: Koike, Michitaro
name: Kokubo, Mitsuru
name: Komiyama, Yutaka
name: Li, Xiangchong
name: Liang, Yongming
name: Lin, Yen-Ting
name: Lupton, Robert H.
name: Lust, Nate B
name: MacArthur, Lauren A.
name: Mawatari, Ken
name: Mineo, Sogo
name: Miyatake, Hironao
name: Miyazaki, Satoshi
name: More, Surhud
name: Morishima, Takahiro
name: Murayama, Hitoshi
name: Nakajima, Kimihiko
name: Nakata, Fumiaki
name: Nishizawa, Atsushi J.
name: Oguri, Masamune
name: Okabe, Nobuhiro
name: Okura, Yuki
name: Ono, Yoshiaki
name: Osato, Ken
name: Ouchi, Masami
name: Pan, Yen-Chen
name: Malagón, Andrés A. Plazas
name: Price, Paul A.
name: Reed, Sophie L
name: Rykoff, Eli S.
name: Shibuya, Takatoshi
name: Simunovic, Mirko
name: Strauss, Michael A.
name: Sugimori, Kanako
name: Suto, Yasushi
name: Suzuki, Nao
name: Takada, Masahiro
name: Takagi, Yuhei
name: Takata, Tadafumi
name: Takita, Satoshi
name: Tanaka, Masayuki
name: Tang, Shenli
name: Taranu, Dan S.
name: Terai, Tsuyoshi
name: Toba, Yoshiki
name: Turner, Edwin L.
name: Uchiyama, Hisakazu
name: Vijarnwannaluk, Bovornpratch
name: Waters, Christopher Z
name: Yamada, Yoshihiko
name: Yamamoto, Naoaki
name: Yamashita, Takuji
Publisher: name: arXiv
Year: 2021
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: FOS: Physical sciences
subject: FOS: Physical sciences

description: The paper presents the third data release of Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP), a wide-field multi-band imaging survey with the Subaru 8.2m telescope. HSC-SSP has three survey layers (Wide, Deep, and UltraDeep) with different area coverages and depths, designed to address a wide array of astrophysical questions. This third release from HSC-SSP includes data from 278 nights of observing time and covers about 670 square degrees in all five broad-band filters at the full depth ($\sim26$~mag at $5σ$) in the Wide layer. If we include partially observed area, the release covers 1,470 square degrees. The Deep and UltraDeep layers have $\sim80\%$ of the originally planned integration times, and are considered done, as we have slightly changed the observing strategy in order to compensate for various time losses. There are a number of updates in the image processing pipeline. Of particular importance is the change in the sky subtraction algorithm; we subtract the sky on small scales before the detection and measurement stages, which has significantly reduced false detections. Thanks to this and other updates, the overall quality of the processed data has improved since the previous release. However, there are limitations in the data (for example, the pipeline is not optimized for crowded fields), and we encourage the user to check the quality assurance plots as well as a list of known issues before exploiting the data. The data release website is https://hsc-release.mtk.nao.ac.jp/.
description: 25 pages, 19 figures, submitted to PASJ. Data available at https://hsc-release.mtk.nao.ac.jp/