Exploring the baryonic effect signature in the Hyper Suprime-Cam Year 3 cosmic shear two-point correlations on small scales: The <math display="inline"><msub><mi>S</mi><mn>8</mn></msub></math> tension remains present - INSPIRE

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Exploring the baryonic effect signature in the Hyper Suprime-Cam Year 3 cosmic shear two-point correlations on small scales: The $S_{8}$ tension remains present

Mar 29, 2024

30 pages

Published in:

Phys.Rev.D 111 (2025) 6, 063509

Published: Mar 4, 2025

e-Print:

2403.20323 [astro-ph.CO]

DOI:

10.1103/PhysRevD.111.063509 (publication)

View in:

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Abstract: (APS)

The baryonic feedback effect is considered as a possible solution to the so-called

S_{8}

tension indicated in cosmic shear cosmology. The baryonic effect is more significant on smaller scales, and it affects the cosmic shear two-point correlation functions (2PCFs) with different scale and redshift dependencies from those of the cosmological parameters. In this paper, we use the Hyper Suprime-Cam Year 3 (HSC-Y3) data to measure the cosmic shear 2PCFs (

ξ_{\pm}

) down to 0.28 arcminutes, taking full advantage of the high number density of source galaxies in the deep HSC data, to explore a possible signature of the baryonic effect. While the published HSC analysis used the cosmic shear 2PCFs on the angular scales that are sensitive to the matter power spectrum at

k ≲ 1 h {Mpc}^{- 1}

, the smaller-scale HSC cosmic shear signal allows us to probe the signature of the matter power spectrum up to

k ≃ 20 h {Mpc}^{- 1}

. Using the accurate emulator of the nonlinear matter power spectrum, darkemulator2, we show that the dark-matter-only model can provide an acceptable fit to the HSC-Y3 2PCFs down to the smallest scales. In other words, we do not find any clear signature of the baryonic effects, or we do not find a systematic shift in the

S_{8}

value with the inclusion of the smaller-scale information as would be expected if the baryonic effect were significant. Alternatively, we use a flexible six-parameter model of the baryonic effects, which can lead to both enhancement and suppression in the matter power spectrum compared to the dark-matter-only model, to perform the parameter inference of the HSC-Y3 2PCFs. We find that the small-scale HSC data allow only a fractional suppression of up to 5% in the matter power spectrum at

k \sim 1 h {Mpc}^{- 1}

, which is not sufficient to reconcile the

S_{8}

tension. Finally, we discuss that

ξ_{-}

on scales smaller than a few arcminutes can be used to monitor characteristic features caused by the baryonic effect if present, while

ξ_{\pm}

with appropriate scale cuts can be used to constrain the cosmological parameters, simultaneously.

Note:

30 pages, 16 figures

References(106)

Figures(17)

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