Hyper Suprime-Cam Year 3 Results: Cosmology from Cosmic Shear Power Spectra
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2023
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| author | Dalal, Roohi Li, Xiangchong Nicola, Andrina Zuntz, Joe Strauss, Michael A. Sugiyama, Sunao Zhang, Tianqing Rau, Markus M. Mandelbaum, Rachel Takada, Masahiro More, Surhud Miyatake, Hironao Kannawadi, Arun Shirasaki, Masato Taniguchi, Takanori Takahashi, Ryuichi Osato, Ken Hamana, Takashi Oguri, Masamune Nishizawa, Atsushi J. Malagón, Andrés A. Plazas Sunayama, Tomomi Alonso, David Slosar, Anže Armstrong, Robert Bosch, James Komiyama, Yutaka Lupton, Robert H. Lust, Nate B. MacArthur, Lauren A. Miyazaki, Satoshi Murayama, Hitoshi Nishimichi, Takahiro Okura, Yuki Price, Paul A. Tait, Philip J. Tanaka, Masayuki Wang, Shiang-Yu |
| author_facet | Dalal, Roohi Li, Xiangchong Nicola, Andrina Zuntz, Joe Strauss, Michael A. Sugiyama, Sunao Zhang, Tianqing Rau, Markus M. Mandelbaum, Rachel Takada, Masahiro More, Surhud Miyatake, Hironao Kannawadi, Arun Shirasaki, Masato Taniguchi, Takanori Takahashi, Ryuichi Osato, Ken Hamana, Takashi Oguri, Masamune Nishizawa, Atsushi J. Malagón, Andrés A. Plazas Sunayama, Tomomi Alonso, David Slosar, Anže Armstrong, Robert Bosch, James Komiyama, Yutaka Lupton, Robert H. Lust, Nate B. MacArthur, Lauren A. Miyazaki, Satoshi Murayama, Hitoshi Nishimichi, Takahiro Okura, Yuki Price, Paul A. Tait, Philip J. Tanaka, Masayuki Wang, Shiang-Yu |
| contents | We measure weak lensing cosmic shear power spectra from the three-year galaxy shear catalog of the Hyper Suprime-Cam (HSC) Subaru Strategic Program imaging survey. The shear catalog covers $416 \ \mathrm{deg}^2$ of the northern sky, with a mean $i$-band seeing of 0.59 arcsec and an effective galaxy number density of 15 $\mathrm{arcmin}^{-2}$ within our adopted redshift range. With an $i$-band magnitude limit of 24.5 mag, and four tomographic redshift bins spanning $0.3 \leq z_{\mathrm{ph}} \leq 1.5$ 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 $300<\ell<1800$. 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 $Λ$CDM model, we find $S_8 \equiv σ_8 (Ω_m/0.3)^{0.5} =0.776^{+0.032}_{-0.033}$, 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 $\sim$$2σ$-level tension with the Planck 2018 cosmology. We study the effect that various systematic errors and modeling choices could have on this value, and find that they can shift the best-fit value of $S_8$ by no more than $\sim$$0.5σ$, indicating that our result is robust to such systematics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_00701 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Hyper Suprime-Cam Year 3 Results: Cosmology from Cosmic Shear Power Spectra Dalal, Roohi Li, Xiangchong Nicola, Andrina Zuntz, Joe Strauss, Michael A. Sugiyama, Sunao Zhang, Tianqing Rau, Markus M. Mandelbaum, Rachel Takada, Masahiro More, Surhud Miyatake, Hironao Kannawadi, Arun Shirasaki, Masato Taniguchi, Takanori Takahashi, Ryuichi Osato, Ken Hamana, Takashi Oguri, Masamune Nishizawa, Atsushi J. Malagón, Andrés A. Plazas Sunayama, Tomomi Alonso, David Slosar, Anže Armstrong, Robert Bosch, James Komiyama, Yutaka Lupton, Robert H. Lust, Nate B. MacArthur, Lauren A. Miyazaki, Satoshi Murayama, Hitoshi Nishimichi, Takahiro Okura, Yuki Price, Paul A. Tait, Philip J. Tanaka, Masayuki Wang, Shiang-Yu Cosmology and Nongalactic Astrophysics We measure weak lensing cosmic shear power spectra from the three-year galaxy shear catalog of the Hyper Suprime-Cam (HSC) Subaru Strategic Program imaging survey. The shear catalog covers $416 \ \mathrm{deg}^2$ of the northern sky, with a mean $i$-band seeing of 0.59 arcsec and an effective galaxy number density of 15 $\mathrm{arcmin}^{-2}$ within our adopted redshift range. With an $i$-band magnitude limit of 24.5 mag, and four tomographic redshift bins spanning $0.3 \leq z_{\mathrm{ph}} \leq 1.5$ 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 $300<\ell<1800$. 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 $Λ$CDM model, we find $S_8 \equiv σ_8 (Ω_m/0.3)^{0.5} =0.776^{+0.032}_{-0.033}$, 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 $\sim$$2σ$-level tension with the Planck 2018 cosmology. We study the effect that various systematic errors and modeling choices could have on this value, and find that they can shift the best-fit value of $S_8$ by no more than $\sim$$0.5σ$, indicating that our result is robust to such systematics. |
| title | Hyper Suprime-Cam Year 3 Results: Cosmology from Cosmic Shear Power Spectra |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2304.00701 |