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

PASJ: Publications of the Astronomical Society of Japan

Utsumi, Yousuke¹  Takahashi, Ryuichi²  Speagle, Joshua S²  Shirasaki, Masato³  Hikage, Chiaki⁴  Okabe, Nobuhiro⁴  Leauthaud, Alexie⁴  Coupon, Jean⁴  Strauss, Michael A⁵  Bosch, James⁶  Takada, Masahiro⁶  Medezinski, Elinor⁷  Tanaka, Masayuki⁸  Coulton, William R⁹  Miyatake, Hironao^1,10  Murata, Ryoma^1,10  Huang, Song^1,11  Simet, Melanie^1,11  Hamana, Takashi^1,11  Sifón, Cristóbal^1,11  Czakon, Nicole^1,11  More, Surhud^1,11  Miyazaki, Satoshi^1,12  Mandelbaum, Rachel^1,12  Nishizawa, Atsushi J^1,13  Oguri, Masamune^1,13  Okura, Yuki^1,13  Komiyama, Yutaka^1,14  Lupton, Robert H^1,15  Armstrong, Robert^1,16  Lanusse, François^1,17 

[1] Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan;Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA;Department of Astronomy, University of Geneva, ch. d’Écogia 16, 1290 Versoix, Switzerland;Department of Astrophysical Sciences, 4 Ivy Lane, Princeton University, Princeton, NJ 08544, USA;Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Harvard University, 60 Garden St, Cambridge, MA 02138, USA;Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Institute for Advanced Research, Nagoya University, Furocho Chikusa-ku, Nagoya, Aichi 464-8602, Japan;Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), UTIAS, Tokyo Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;RIKEN-BNL Research Center, Department of Physics, Brookhaven National Laboratory, Bldg. 510, Upton, NY 11792, USA;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USA

关键词: cosmology: observations;    gravitational lensing: weak;    methods: data analysis;    techniques: image processing;   

DOI  :  10.1093/pasj/psx130

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

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|${^{\prime\prime}_{.}}$|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 ρ1 < 3 × 10−7 (requirement: 4 × 10−7) at 0|${^{\circ}_{.}}$|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.

【 授权许可】

CC BY