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

Publications of the Astronomical Society of Japan, 2018-01, Vol.70 (SP1) [Peer Reviewed Journal]

The Author(s) 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For Permissions, please email: journals.permissions@oup.com 2018 ;ISSN: 0004-6264 ;EISSN: 2053-051X ;DOI: 10.1093/pasj/psx130

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Title:
The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey
Author: Mandelbaum, Rachel ; Miyatake, Hironao ; Hamana, Takashi ; Oguri, Masamune ; Simet, Melanie ; Armstrong, Robert ; Bosch, James ; Murata, Ryoma ; Lanusse, François ; Leauthaud, Alexie ; Coupon, Jean ; More, Surhud ; Takada, Masahiro ; Miyazaki, Satoshi ; Speagle, Joshua S ; Shirasaki, Masato ; Sifón, Cristóbal ; Huang, Song ; Nishizawa, Atsushi J ; Medezinski, Elinor ; Okura, Yuki ; Okabe, Nobuhiro ; Czakon, Nicole ; Takahashi, Ryuichi ; Coulton, William R ; Hikage, Chiaki ; Komiyama, Yutaka ; Lupton, Robert H ; Strauss, Michael A ; Tanaka, Masayuki ; Utsumi, Yousuke
Is Part Of: Publications of the Astronomical Society of Japan, 2018-01, Vol.70 (SP1)
Description: Abstract 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.
Publisher: Oxford University Press
Language: English
Identifier: ISSN: 0004-6264
EISSN: 2053-051X
DOI: 10.1093/pasj/psx130
Source: Freely Accessible Japanese Titles

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

The Author(s) 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For Permissions, please email: journals.permissions@oup.com 2018 ;ISSN: 0004-6264 ;EISSN: 2053-051X ;DOI: 10.1093/pasj/psx130

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