Second data release of the Hyper Suprime-Cam Subaru Strategic Program

By H. Aihara, Yusra AlSayyad, M. Ando, R. Armstrong, James F. Bosch, E. Egami, H. Furusawa, J. Furusawa, A. Goulding, Y. Harikane and 55 more. Nippon Tenmon Gakkai obun kenkyu hokoku, 2019

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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 deg$^2$ 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 deg$^2$ is observed in at least one filter and one exposure. The median seeing in the i-band is ${0_{.}^{\prime \prime }6}$, 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 $i\sim 28$ at $5 \, \sigma$ 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 deg$^2$). All products are available at the data release site, https://hsc-release.mtk.nao.ac.jp/.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/e8ff075f914dfc6447e2e10cf369974015ce4338

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Citations in the corpus

Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2019, methodology): “In addition to this, improvement efforts on several analysis techniques are underway, including PSF measurement and modeling (Aihara et al. 2019), photo-z estimations, and shear measurements.”
The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 – 15 from deep JWST and ground-based near-infrared imaging (2022, methodology): “We also include wider-area optical data covering the full UltraVISTAfield from theHyper Suprime-CamSubaru Strategic Program (HSC-SSP) DR2 (Aihara et al. 2019) in the 𝐺𝑅𝐼𝑍𝑦 filters as well as in two narrow bands, 𝑁𝐵816 and 𝑁𝐵921.”
The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V (2023, methodology): “Similar to the bhm_spiders_clusters-efeds-lsredmapper carton, except that the red-sequence finder algorithm is run on the HSC-SSP DR2 photometric catalog (Aihara et al. 2019). bhm_spiders_clusters-efeds-erosita.”
COSMOS2020: A Panchromatic View of the Universe to z ∼ 10 from Two Complementary Catalogs (2021, methodology): “COSMOS2020 uses the second public data release (PDR2) of the HSC Subaru Strategic Program (HSC-SSP) comprising the g, r, i, z, y bands (Aihara et al. 2019).”
Illuminating Low Surface Brightness Galaxies with the Hyper Suprime-Cam Survey (2017, background): “An overview of the full survey design is given in Aihara et al. (2018b), and the first public data release, which covers ∼100 deg2, is described in Aihara et al. (2018a).”
Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ∼2000 Lyα emitters at z = 6–7 over the 0.3–0.5 Gpc2 survey area (2017, methodology): “Figures 2 and 3 present the transmission curves of the HSC NB816 and NB921 filters that are used in the HSC first-data release (Aihara et al. 2018).”
Photometric Redshifts for Hyper Suprime-Cam Subaru Strategic Program Data Release 1 (2017, methodology): “We use the CModel photometry, but as described in Aihara et al. (2019), the photometry is occasionally over-estimated due to severe object blending (a side effect of well-preserved wings of bright objects).”
Target Selection and Validation of DESI Emission Line Galaxies (2022, background): “That figure displays the density of gfib< 24.1 objects in the LS-DR9 catalogs, where the color-coding indicates the mean photometric redshift (zphot) from HSC/DR2 (Tanaka et al. 2018; Aihara et al. 2019).”