Sunyaev-Zel'dovich clusters in millennium gas simulations

摘要: Large surveys using the Sunyaev–Zel’dovich (SZ) effect to find clusters of galaxies are now starting yield large numbers systems out high redshift, many which new dis- coveries. In order provide theoretical interpretation for release full SZ cluster samples over next few years, we have exploited large-volume Millennium gas cosmo- logical N-body hydrodynamics simulations study population at low and three models with varying physics. We confirm previous results smaller samplesthattheintrinsic(spherical)Y500–M500relationhasverylittlescatter(σlog10Y ≃0.04), is insensitive physics evolves redshift 1 in accordance self-similar expectations. Our preheating feedback predict scaling relations that excel- lent agreement recent analysis from combined Planck XMM–Newton data by Collaboration. This largely preserved when r500 M500 derived thehydrostaticmassproxy,YX,500,albeitwithsignificantlyreducedscatter(σlog10Y ≃0.02),a result due tight correlation between Y500 YX,500. Interestingly, this assumption also hides any bias relation dynamical activity. assess importance projection effects large-scale structure along line sight, extracting values 50 simulated 5 × 5-deg2 sky maps. Once (model-dependent) mean signal subtracted maps integrated unbiased respect underlying clusters, although scatter (cylindrical) Y500–M500 increases case, where a significant amount energy was injected into intergalactic medium redshift. Finally, hot pressure profiles investigate origin largest contribution comes radii close all cases. The themselves well described generalized Navarro, Frenk & White but there cluster-to-cluster scatter. conclusion, our support notion robust mass proxy use cosmological analyses clusters.