Two- and three-dimensional wide-field weak lensing mass maps from the Hyper Suprime-Cam Subaru Strategic Program S16A data

Oguri, Masamune; Miyazaki, Satoshi; Hikage, Chiaki; Mandelbaum, Rachel; Utsumi, Yousuke; Miyatake, Hironao; Takada, Masahiro; Armstrong, R.; Bosch, James; Komiyama, Yutaka; Leauthaud, Alexie; More, Surhud; Nishizawa, Atsushi J.; Okabe, Nobuhiko; Tanaka, Masayuki

doi:10.1093/pasj/psx070

Cited by 69 publications

(61 citation statements)

References 66 publications

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“…Nevertheless, the observed distortion contains an additional scatter due to the shape measurement error. Following Oguri et al (2018) we simulate an "observed" distortion of each galaxy taking into account both the intrinsic shape and measurement error. We first rotate the distortion of individual galaxies obs and obtain the rotated distortion as ran = obs e iφ , where φ is a random number between 0 and 2π.…”

Section: Mock Cataloguesmentioning

confidence: 99%

Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey

Shirasaki

Hamana

Takada

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We use the full-sky ray-tracing weak lensing simulations to generate 2268 mock catalogues for the Subaru Hyper Suprime-Cam (HSC) survey first-year shear catalogue. Our mock catalogues take into account various effects as in the real data: the survey footprints, inhomogeneous angular distribution of source galaxies, statistical uncertainties in photometric redshift (photo-z) estimate, variations in the lensing weight, and the statistical noise in galaxy shape measurements including both intrinsic shapes and the measurement errors. We then utilize our mock catalogues to evaluate statistical uncertainties expected in measurements of cosmic shear twopoint correlations ξ ± with tomographic redshift information for the HSC survey. We develop a quasi-analytical formula for the Gaussian sample variance properly taking into account the number of source pairs in the survey footprints. The standard Gaussian formula significantly overestimates or underestimates the mock results by 50% level. We also show that different photo-z catalogues or the six disconnected fields, rather than a consecutive geometry, cause variations in the covariance by ∼ 5%. The mock catalogues enable us to study the chi-square distribution for ξ ± . We find the wider distribution than that naively expected for the distribution with the degrees-of-freedom of data vector used. Finally, we propose a method to include nonzero multiplicative bias in mock shape catalogue and show the non-zero multiplicative bias can change the effective shape noise in cosmic shear analyses. Our results suggest an importance of estimating an accurate form of the likelihood function (and therefore the covariance) for robust cosmological parameter inference from the precise measurements.

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Section: Mock Cataloguesmentioning

confidence: 99%

Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey

Shirasaki

Hamana

Takada

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…We describe the estimator from convergence which is reconstructed by the shape of galaxies distorted (Oguri et al 2018). The gravitational lensing distorts the image of the source galaxies.…”

Section: Convergence Measurementioning

confidence: 99%

Effect of lensing magnification on type Ia supernova cosmology

Sakakibara

Nishizawa

Oguri

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Effect of gravitational magnification on the measurement of distance modulus of type Ia supernovae is presented. We investigate a correlation between magnification and Hubble residual to explore how the magnification affects the estimation of cosmological parameters. We estimate magnification of type Ia supernovae in two distinct methods: one is based on convergence mass reconstruction under the weak lensing limit and the other is based on the direct measurement from galaxies distribution. Both magnification measurements are measured from Subaru Hyper Suprime-Cam survey catalogue. For both measurements, we find no significant correlation between Hubble residual and magnification. Furthermore, we correct for the apparent supernovae fluxes obtained by Supernova Legacy Survey 3-year sample using direct measurement of the magnification. We find Ω m0 = 0.287 +0.104 −0.085 and w = −1.161 +0.595 −0.358 for supernovae samples corrected for lensing magnification when we use photometric redshift catalogue of Mizuki, while Ω m0 = 0.253 +0.113 −0.087 and w = −1.078 +0.498 −0.297 for DEmP photo-z catalogue. Therefore, we conclude that the effect of magnification on the supernova cosmology is negligibly small for the current surveys; however, it has to be considered for the future supernova survey like LSST.

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“…This can be identified as the reason for the formation of the large-scale structure in the universe. An alternative is to measure the precise CMB temperature in the region where dark matter is considered to exist [25,26]. The model predicts that the CMB temperature in that region is higher than elsewhere because larger values of G and m e can be identified as dark matter.…”

Section: Discussionmentioning

confidence: 99%

Application of Self-Similar Symmetry Model to Dark Energy

Sonoda¹

2018

Preprint

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Recent observations of the dark energy density demonstrates the fine-tuning problem and challenges in theoretical modelling. In this study, we apply the self-similar symmetry (SSS) model, describing the hierarchical structure of the universe based on the Dirac large numbers hypothesis, to Einstein's cosmological term. We introduce a new similarity dimension, DB, in the SSS model. Using the DB SSS model, the cosmological constant, vacuum energy density, and Hubble parameter can be simply expressed as a function of the cosmic microwave background (CMB) temperature. We show that the initial value of the vacuum energy density at the creation of the universe is ρ0 = 1/8παf6, where αf is the fine structure constant. The results indicate that the CMB is the primary factor for the evolution of the universe, providing a unified understanding of the problems of naturalness.

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Two- and three-dimensional wide-field weak lensing mass maps from the Hyper Suprime-Cam Subaru Strategic Program S16A data

Cited by 69 publications

References 66 publications

Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey

Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey

Effect of lensing magnification on type Ia supernova cosmology

Application of Self-Similar Symmetry Model to Dark Energy

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