Relativistic SZ temperature scaling relations of groups and clusters derived from the BAHAMAS and MACSIS simulations

Abstract

The Sunyaev-Zeldovich (SZ) effect has long been recognized as a powerful cosmological probe. Using the BAHAMAS and MACSIS simulations to obtain $>10,000$ simulated galaxy groups and clusters, we compute three temperature measures and quantify the differences between them. The first measure is related to the X-ray emission of the cluster, while the second describes the non-relativistic thermal SZ (tSZ) effect. The third measure determines the lowest order relativistic correction to the tSZ signal, which is seeing increased observational relevance. Our procedure allows us to accurately model the relativistic SZ (rSZ) contribution and we show that a $\gtrsim 10\%-40\%$ underestimation of this rSZ cluster temperature is expected when applying standard X-ray relations. The correction also exhibits significant mass and redshift evolution, as we demonstrate here. We present the mass dependence of each temperature measure alongside their profiles and a short analysis of the temperature dispersion as derived from the aforementioned simulations. We also discuss a new relation connecting the temperature and Compton-$y$ parameter, which can be directly used for rSZ modelling. Simple fits to the obtained scaling relations and profiles are provided. These should be useful for future studies of the rSZ effect and its relevance to cluster cosmology.

Accepted by MNRAS

References in corpus (13)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Systematics in the X-ray Cluster Mass Estimators
• Baryons at the Edge of the X-ray Brightest Galaxy Cluster
• The redshift evolution of massive galaxy clusters in the MACSIS simulations
• The impact of baryons on massive galaxy clusters: halo structure and cluster mass estimates
• The Three Hundred Project: correcting for the hydrostatic-equilibrium mass bias in X-ray and SZ surveys
• Reconstructing mass profiles of simulated galaxy clusters by combining Sunyaev-Zeldovich and X-ray images
• PICO: Probe of Inflation and Cosmic Origins
• Hydrostatic mass estimates of massive galaxy clusters: a study with varying hydrodynamics flavours and non-thermal pressure support
• Pressure profiles of distant galaxy clusters in the Planck catalog
• The Sunyaev-Zel'dovich temperature of the intracluster medium
• High significance detection of the tSZ effect relativistic corrections
• Measuring the Hubble Constant with the Sunyaev-Zel'dovich Effect

Cited by in corpus (5)

• A multi-simulation study of relativistic SZ temperature scalings in galaxy clusters and groups
• Sensitivity forecasts for the cosmological recombination radiation in the presence of foregrounds
• The challenge of measuring and mapping the missing baryons
• Percent-level constraints on baryonic feedback with spectral distortion measurements
• Refined modelling of the radio SZ signal: kinematic terms, relativistic temperature corrections and anisotropies in the radio background