Kavli Affiliate: Jia Liu
| First 5 Authors: Daniela Grandón, Gabriela A. Marques, Leander Thiele, Sihao Cheng, Masato Shirasaki
| Summary:
Baryonic feedback is a major systematic in weak lensing cosmology. Its most
studied effect is the suppression of the lensing power spectrum, a second-order
statistic, on small scales. Motivated by the growing interest in statistics
beyond the second order, we investigate the effect of baryons on lensing
non-Gaussian statistics and the resulting biases in the matter clustering
amplitude $S_8 = sigma_8sqrt{Omega_m/0.3}$. We focus on the Subaru Hyper
Suprime-Cam Year 1 (HSC-Y1) data which, with its high source number density,
closely resembles those expected from the upcoming Euclid and Rubin LSST. We
study four non-Gaussian statistics — peak counts, minimum counts, the
probability distribution function, and the scattering transform — in addition
to the usual power spectrum. We first estimate the biases in $S_8$ using mock
observations built from the IllustrisTNG and BAHAMAS hydrodynamical simulations
and theoretical models built from dark matter-only simulations. We find up to
$1sigma$ bias in $S_8$ when the smallest scales (2 arcmin) and the highest
feedback level are considered. We then analyze the HSC-Y1 data and compare the
$S_8$ obtained for each statistic with different smoothing scales or scale
cuts. As we expect that baryons mostly affect the small scales, comparing the
results obtained from including and excluding small scales can indicate the
level of impact from baryons. With HSC data, we find only minor
($leq0.5sigma$) differences in $S_8$ for all statistics, even when
considering very small scales (2 arcmin). Our results suggest that the effect
of baryons is insignificant at the level of HSC-Y1 down to 2~arcmin for all
statistics examined here, or it is canceled by other scale-dependent
systematics.
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