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

PASJ: Publications of the Astronomical Society of Japan

Miyazaki, Satoshi¹  Miyama, Shoken¹  Sifón, Cristóbal²  Medezinski, Elinor³  Simet, Melanie⁴  Speagle, Joshua⁴  Lupton, Robert H⁴  Lanusse, François⁵  Yamada, Yoshihiko⁵  More, Surhud⁵  Hsieh, Bau-Ching⁶  Coupon, Jean⁶  Sugiyama, Naoshi⁷  Bosch, James⁸  Ho, Paul⁸  Ducout, Anne⁹  Hikage, Chiaki^1,10  Aihara, Hiroaki^1,10  Nishizawa, Atsushi J^1,10  Mineo, Sogo^1,10  Wang, Shiang-Yu^1,10  Takada, Masahiro^1,10  Oguri, Masamune^1,10  Komiyama, Yutaka^1,10  Armstrong, Robert^1,10  Leauthaud, Alexie^1,11  Shirasaki, Masato^1,12  Miyatake, Hironao^1,12  Mandelbaum, Rachel^1,13  Tanaka, Masayuki^1,13  Murata, Ryoma^1,13  Spergel, David N^1,13  Strauss, Michael A^1,13  Hamana, Takashi^1,14  Utsumi, Yousuke^1,15  Murayama, Hitoshi^1,15  Köhlinger, Fabian^1,16 

[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 St., Santa Cruz, CA 95064, USA;Department of Astronomy, University of Geneva, ch. d’Écogia 16, 1290 Versoix, Switzerland;Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan;Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan;Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;Lawrence Livermore National Laboratory, Livermore, CA 94551, USA;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;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;The Inter-University Center for Astronomy and Astrophysics, Post bag 4, Ganeshkhind, Pune, 411007, India

关键词: gravitational lensing: weak;    (cosmology:) dark matter;    (cosmology:) large-scale structure of universe;   

DOI  :  10.1093/pasj/psz010

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

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.

【 授权许可】

CC BY