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

By Rachel Mandelbaum, H. Miyatake, T. Hamana, M. Oguri, M. Simet, R. Armstrong, James F. Bosch, Ryoma Murata, Franccois Lanusse, A. Leauthaud and 21 more. 2017

158 citations recorded by the source corpus.

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 $0.58$ arcsec and $5\sigma$ point-source depth of $i\sim 26$. 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 $\rho_1 1^\circ$ 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.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c1738fd4ee043e198fe14bf0809e5c68bb4061f2

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Citations in the corpus

The Simons Observatory: science goals and forecasts (2018, background): “Stateof-the-art optical lensing analyses currently reach ∼ 1% shear calibration (Zuntz et al. 2017; Fenech Conti et al. 2017; Mandelbaum et al. 2017), relying in most – but not all – cases on image simulations, and are expected to achieve the stringent ∼ 0.5% requirement for LSST, Euclid and WFIRST…”
The Hyper Suprime-Cam SSP Survey: Overview and Survey Design (2017, methodology): “The details of the galaxy shape catalog used for the WL measurements are given in Mandelbaum et al. (2017).”
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2018, methodology): “In the HSC first-year shear catalog, the intrinsic ellipticity was estimated as a function of S/N and resolution factorR2 using image simulations (Mandelbaum et al. 2017).”
Illuminating Low Surface Brightness Galaxies with the Hyper Suprime-Cam Survey (2017, methodology): “…bright object mask by taking the union of the source footprints (bright sources + associated diffuse light) and the bright object masks provided by hscPipe—we use an early version of the masks called Sirius (Mandelbaum et al. 2018), which has since been superseded by Arcturus (Coupon et al. 2018).”