The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey

Rachel Mandelbaum, Hironao Miyatake, Takashi Hamana, Masamune Oguri, Melanie Simet, Robert Armstrong, James Bosch, Ryoma Murata, François Lanusse, Alexie Leauthaud, Jean Coupon, Surhud More, Masahiro Takada, Satoshi Miyazaki, Joshua S. Speagle, Masato Shirasaki, Cristóbal Sifón, Song Huang, Atsushi J. Nishizawa, Elinor MedezinskiYuki Okura, Nobuhiro Okabe, Nicole Czakon, Ryuichi Takahashi, William R. Coulton, Chiaki Hikage, Yutaka Komiyama, Robert H. Lupton, Michael A. Strauss, Masayuki Tanaka, Yousuke Utsumi

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173 Scopus citations


We present and characterize the catalog of galaxy shape measurements that will be used for cosmological weak lensing measurements in the Wide layer of the first year of the Hyper Suprime-Cam (HSC) survey. The catalog covers an area of 136.9 deg2 split into six fields, with a mean i-band seeing of 0.58 and 5σ point-source depth of i ∼ 26. Given conservative galaxy selection criteria for first-year science, the depth and excellent image quality results in unweighted and weighted source number densities of 24.6 and 21.8 arcmin-2, respectively. We define the requirements for cosmological weak lensing science with this catalog, then focus on characterizing potential systematics in the catalog using a series of internal null tests for problems with point-spread function (PSF) modeling, shear estimation, and other aspects of the image processing. We find that the PSF models narrowly meet requirements for weak lensing science with this catalog, with fractional PSF model size residuals of approximately 0.003 (requirement: 0.004) and the PSF model shape correlation function I1 < 3 × 10-7 (requirement: 4 × 10-7) at 0.5 scales. A variety of galaxy shape-related null tests are statistically consistent with zero, but star-galaxy shape correlations reveal additive systematics on >1 scales that are sufficiently large as to require mitigation in cosmic shear measurements. Finally, we discuss the dominant systematics and the planned algorithmic changes to reduce them in future data reductions.

Original languageEnglish (US)
Article numberS25
JournalPublications of the Astronomical Society of Japan
Issue numberSpecial Issue 1
StatePublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmology
  • Data analysis-techniques
  • Image processing
  • Observations-gravitational lensing
  • Weak-methods


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