Abstract
We measure weak lensing cosmic shear power spectra from the 3-year galaxy shear catalog of the Hyper Suprime-Cam (HSC) Subaru Strategic Program imaging survey. The shear catalog covers of the northern sky, with a mean -band seeing of 0.59 arcsec and an effective galaxy number density of within our adopted redshift range. With an -band magnitude limit of 24.5 mag, and four tomographic redshift bins spanning based on photometric redshifts, we obtain a high-significance measurement of the cosmic shear power spectra, with a signal-to-noise ratio of approximately 26.4 in the multipole range . The accuracy of our power spectrum measurement is tested against realistic mock shear catalogs, and we use these catalogs to get a reliable measurement of the covariance of the power spectrum measurements. We use a robust blinding procedure to avoid confirmation bias, and model various uncertainties and sources of bias in our analysis, including point spread function systematics, redshift distribution uncertainties, the intrinsic alignment of galaxies and the modeling of the matter power spectrum. For a flat model, we find , which is in excellent agreement with the constraints from the other HSC Year 3 cosmology analyses, as well as those from a number of other cosmic shear experiments. This result implies a -level tension with the Planck 2018 cosmology. We study the effect that various systematic errors and modeling choices could have on this value, and find that they can shift the best-fit value of by no more than , indicating that our result is robust to such systematics.
11 More- Received 5 April 2023
- Accepted 16 August 2023
DOI:https://doi.org/10.1103/PhysRevD.108.123519
© 2023 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Inconsistency Turns Up Again for Cosmological Observations
Published 11 December 2023
A new analysis of the distribution of matter in the Universe continues to find a discrepancy in the clumpiness of dark matter in the late and early Universe, suggesting a fundamental error in the standard cosmological model.
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