Probing the evolution of galaxy clusters using SZ effect and non-thermal emission: first results from A1413

TL;DR

This study investigates how deviations in galaxy cluster gas pressure profiles relate to radio emissions, using SZ effect data and low-frequency radio observations of Abell 1413 to understand cluster mass measurement biases.

Contribution

It presents the first analysis linking pressure profile deviations with radio emission in galaxy clusters, highlighting the impact of mergers on mass estimates.

Findings

Pressure profile deviations correlate with radio emission presence.

Merging activity influences hydrostatic equilibrium assumptions.

Results aid in calibrating cluster mass measurements.

Abstract

Mass is the most fundamental property of galaxy clusters. However, measuring it is still a challenge. Calibrating mass from intracluster medium observables such as the Sunyaev-Zel'dovich (SZ) effect is subject to uncertainty and biases because of the hydrostatic equilibrium assumption. On the other hand, merging cluster systems have been shown to exhibit radio emission which implies a link with disturbances from hydrostatic equilibrium. We present work on studying deviations of galaxy cluster gas pressure profile from the average (universal) pressure profile using an example of galaxy cluster Abell 1413 with SZ effect data from the Arcminute Microkelvin Imager and Planck. This cluster has also been observed at low radio frequency with the Murchison Widefield Array allowing the investigation of links between gas pressure profile deviations and the presence of radio emission.