Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 70, Issue -, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psx130
Keywords
cosmology: observations; gravitational lensing: weak; methods: data analysis; techniques: image processing
Categories
Funding
- FIRST program from Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877, AST-1313169]
- JSPS KAKENHI [26800093, 15H03654, JP17H01131]
- MEXT [15H05887, 15H05892, 15H05893, 15K21733]
- US Department of Energy Early Career Award Program
- Jet Propulsion Laboratory, California Institute of Technology, under a contract National Aeronautics and Space Administration
- University of California Riverside Office of Research and Economic Development through the FIELDS NASAMIRO program
- Japan Society for Promotion of Science [JP15K17600, JP16H01089]
- University of Tokyo-Princeton strategic partnership grant
- Advanced Leading Graduate Course for Photon Science (ALPS)
- WFIRST program
- Grants-in-Aid for Scientific Research [15H05893, 17K05457, 15K21733, 17H06600, 26800093, 15H03654, 17H01131, 16H01089, 15H05892, 17J00658, 16K17684] Funding Source: KAKEN
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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 deg(2) split into six fields, with a mean i-band seeing of 0.58 and 5 sigma point-source depth of i similar to 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 rho(1) < 3 x 10(-7) (requirement: 4 x 10(-7)) at 0 degrees.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 degrees 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.
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