Debiased Galaxy Cluster Pressure Profiles from X-ray Observations and Simulations

Abstract

We present an updated model for the average cluster pressure profile, adjusted for hydrostatic mass bias by combining results from X-ray observations with cosmological simulations. Our model estimates this bias by fitting a power-law to the relation between the "true" halo mass and X-ray cluster mass in hydrodynamic simulations (IllustrisTNG, BAHAMAS, and MACSIS). As an example application, we consider the REXCESS X-ray cluster sample and the Universal Pressure Profile (UPP) derived from scaled and stacked pressure profiles. We find adjusted masses, $M_{500c},$ that are $\lesssim$15% higher and scaled pressures $P/P_{500c}$ that have $\lesssim$35% lower normalization than previously inferred. Our Debiased Pressure Profile (DPP) is well-fit by a Generalized Navarro-Frenk-White (GNFW) function, with parameters $[P_0,c_{500},\alpha ,\beta ,\gamma ]=[5.048,1.217,1.192,5.490,0.433]$ and does not require a mass-dependent correction term. When the DPP is used to model the Sunyaev-Zel'dovich (SZ) effect, we find that the integrated Compton $Y-M$ relation has only minor deviations from self-similar scaling. The thermal SZ angular power spectrum is lower in amplitude by approximately 30%, assuming nominal cosmological parameters (e.g. ${\Omega }_{\text{m}}=0.3$, ${\sigma }_8=0.8$), and is broadly consistent with recent Planck results without requiring additional bias corrections.

13 pages, 5 figures, 3 tables

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• Joint measurement of the galaxy cluster pressure profile with Planck and SPT-SZ
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• Baryon Pasting the Uchuu Lightcone Simulation
• Numerical modelling of the lobes of radio galaxies -- Paper V: Universal Pressure Profile cluster atmospheres
• X-ray and optical analysis of the distant, merging double cluster SPT-CLJ2228-5828, its gas bridge, and shock front
• HI Intensity Mapping cross-correlation with thermal SZ fluctuations: forecasted cosmological parameters estimation for FAST and Planck
• Numerical modelling of the lobes of radio galaxies VI. Polarimetric simulations of universal pressure profile cluster atmospheres
• A Hydro-Particle-Mesh Code for Efficient and Rapid Simulations of the Intracluster Medium
• A comparative test of different pressure profile models in clusters of galaxies using recent ACT data
• Estimating the heterogeneity of pressure profiles within a complete sample of 55 galaxy clusters: a Bayesian Hierarchical Model