Weak-Lensing Analysis Of X-Ray-Selected Xxl Galaxy Groups And Clusters With Subaru Hsc Data

ASTROPHYSICAL JOURNAL(2020)

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摘要
We present a weak-lensing analysis of X-ray galaxy groups and clusters selected from the XMM-XXL survey using the first-year data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program. Our joint weak-lensing and X-ray analysis focuses on 136 spectroscopically confirmed X-ray-selected systems at 0.031 <= z <= 1.033 detected in the 25 deg(2) XXL-N region, which largely overlaps with the HSC-XMM field. With high-quality HSC weak-lensing data, we characterize the mass distributions of individual clusters and establish the concentration-mass (c-M) relation for the XXL sample, by accounting for selection bias and statistical effects and marginalizing over the remaining mass calibration uncertainty. We find the mass-trend parameter of the c-M relation to be beta = -0.07 +/- 0.28 and the normalization to be c(200) = 4.8 +/- 1.0 (stat) +/- 0.8 (syst) at M-200 = 10(14) h(-1) M-circle dot and z = 0.3. We find no statistical evidence for redshift evolution. Our weak-lensing results are in excellent agreement with dark-matter-only c-M relations calibrated for recent.CDM cosmologies. The level of intrinsic scatter in c(200) is constrained as sigma(ln c(200)) < 24% (99.7% CL), which is smaller than predicted for the full population of Lambda CDM halos. This is likely caused in part by the X-ray selection bias in terms of the cool-core or relaxation state. We determine the temperature-mass (T-X-M-500) relation for a subset of 105 XXL clusters that have both measured HSC lensing masses and X- ray temperatures. The resulting T-X-M-500 relation is consistent with the self-similar prediction. Our TX- M500 relation agrees with the XXL DR1 results at group scales but has a slightly steeper mass trend, implying a smaller mass scale in the cluster regime. The overall offset in the T-X-M-500 relation is at the similar to 1.5 sigma level, corresponding to a mean mass offset of 34% +/- 20%. We also provide bias-corrected, weak-lensing-calibrated M-200 and M-500 mass estimates of individual XXL clusters based on their measured X-ray temperatures.
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