Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data

By C. Hikage, M. Oguri, T. Hamana, S. More, Rachel Mandelbaum, M. Takada, F. Kohlinger, H. Miyatake, A. Nishizawa, H. Aihara and 27 more. Nippon Tenmon Gakkai obun kenkyu hokoku, 2018

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We measure cosmic weak lensing shear power spectra with the Subaru Hyper Suprime-Cam (HSC) survey first-year shear catalog covering 137 deg2 of the sky. Thanks to the high effective galaxy number density of ∼17 arcmin−2, even after conservative cuts such as a magnitude cut of i < 24.5 and photometric redshift cut of 0.3 ≤ z ≤ 1.5, we obtain a high-significance measurement of the cosmic shear power spectra in four tomographic redshift bins, achieving a total signal-to-noise ratio of 16 in the multipole range 300 ≤ ℓ ≤ 1900. We carefully account for various uncertainties in our analysis including the intrinsic alignment of galaxies, scatters and biases in photometric redshifts, residual uncertainties in the shear measurement, and modeling of the matter power spectrum. The accuracy of our power spectrum measurement method as well as our analytic model of the covariance matrix are tested against realistic mock shear catalogs. For a flat Λ cold dark matter model, we find $S\,_{8}\equiv \sigma _8(\Omega _{\rm m}/0.3)^\alpha =0.800^{+0.029}_{-0.028}$ for α = 0.45 ($S\,_8=0.780^{+0.030}_{-0.033}$ for α = 0.5) from our HSC tomographic cosmic shear analysis alone. In comparison with Planck cosmic microwave background constraints, our results prefer slightly lower values of S8, although metrics such as the Bayesian evidence ratio test do not show significant evidence for discordance between these results. We study the effect of possible additional systematic errors that are unaccounted for in our fiducial cosmic shear analysis, and find that they can shift the best-fit values of S8 by up to ∼0.6 σ in both directions. The full HSC survey data will contain several times more area, and will lead to significantly improved cosmological constraints.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/a838169c9f15b05bf3e58b69f8a6b77856347028

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Citations in the corpus

KiDS+VIKING-450: Cosmic shear tomography with optical and infrared data (2018, methodology): “In this latter case our results agree better with the measurements from DESy1 (Troxel et al. 2018b) and HSC-DR1 (Hikage et al. 2019).”
Second data release of the Hyper Suprime-Cam Subaru Strategic Program (2019, background): “Our first weak-lensing cosmology results presented in Hikage et al. (2019) are based on this shape catalog.”
Early dark energy does not restore cosmological concordance (2020, background): “For HSC, we use the result from Hikage et al. (2019): S8 = 0.780 +0.030 −0.033.”
The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees (2019, background): “…in such measurements: the Dark Energy Survey (DES; Dark Energy Survey Collaboration 2005)2 and the HyperSuprimeCam survey (HSC; Aihara et al. 2018)3, and all three have reported intermediate cosmology results (Hildebrandt et al. 2017, henceforth KiDS450; Troxel et al. 2018; Hikage et al. 2019).”
Quantifying baryon effects on the matter power spectrum and the weak lensing shear correlation (2018, result): “This conclusion is in agreement with other findings on the importance of baryon effects from KiDS [67, 70] and the HSC survey [71].”
Rock ‘n’ roll solutions to the Hubble tension (2019, neutral): “[47]).”
hmcode-2020: improved modelling of non-linear cosmological power spectra with baryonic feedback (2020, background): “…et al. 2020; Heymans et al. 2020), DES (e.g., Abbott et al. 2018), or HSC (e.g., 2 Taken from the node cosmologies of Heitmann et al. (2014) and Lawrence et al. (2017) MNRAS 000, 1–17 (2020) Hikage et al. 2019; Hamana et al. 2020), although they do contain the Planck Collaboration VI (2018) space.”
Euclid preparation (2021, neutral): “…power spectrum, σ8, have been reported by the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS, Kilbinger et al. 2013), the Kilo Degree Survey (KiDS, Hildebrandt et al. 2017), the Dark Energy Survey (DES, Troxel et al. 2018), and the Hyper-Suprime Camera Survey (HSC, Hikage et al. 2019).”
Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2019, methodology): “The mock catalogs used in this analysis are the ones described in Oguri et al. (2018) and adopted in Hikage et al. (2019).”