Scaling Relations from Sunyaev-Zel'dovich Effect and Chandra X-ray measurements of high-redshift galaxy clusters

TL;DR

This study establishes Sunyaev-Zel'dovich Effect scaling relations for high-redshift galaxy clusters using combined SZE and Chandra X-ray data, confirming consistency with self-similar models and advanced simulations.

Contribution

It provides new SZE scaling relations for high-redshift clusters based on combined X-ray and SZE measurements, validated against cosmological simulations.

Findings

Measurements agree with self-similar cluster evolution models.

SZE and X-ray derived properties are consistent.

Simulations with cooling and feedback match observed relations.

Abstract

We present Sunyaev-Zel'dovich Effect (SZE) scaling relations for 38 massive galaxy clusters at redshifts 0.14<z0.89, observed with both the Cchandra X-ray Observatory and the centimeter-wave SZE imaging system at the BIMA and OVRO interferometric arrays. An isothermal beta-model with central 100 kpc excluded from the X-ray data is used to model the intracluster medium and to measure global cluster properties. For each cluster, we measure the X-ray spectroscopic temperature, SZE gas mass, total mass and integrated Compton-y parameters within r_2500. Our measurements are in agreement with the expectations based on a simple self-similar model of cluster formation and evolution. We compare the cluster properties derived from our SZE observations with and without Chandra spatial and spectral information and find them to be in good agreement. We compare our results with cosmological numerical simulations, and find that simulations that include radiative cooling, star formation and feedback match well both the slope and normalization of our SZE scaling relations.