A Sunyaev-Zel'dovich take on cluster radio haloes -- I. Global scaling and bi-modality using Planck data

TL;DR

This paper establishes new global scaling relations between radio halo power and Sunyaev-Zel'dovich measurements in galaxy clusters, providing insights into the mass dependence and challenging the idea of a bi-modal cluster population.

Contribution

It presents the first use of SZ effect data to study radio halo scaling relations, offering a novel approach to understanding their origin and properties.

Findings

Radio halo power correlates well with SZ measurements.

No strong evidence for a bi-modal distribution of clusters.

The observed scaling slope informs theoretical models.

Abstract

Giant radio haloes in galaxy clusters are the primary evidence for the existence of relativistic particles (cosmic rays) and magnetic fields over Mpc scales. Observational tests for the different theoretical models explaining their powering mechanism have so far been obtained through X-ray selection of clusters, e.g. by comparing cluster X-ray luminosities with radio halo power. Here we present the first global scaling relations between radio halo power and integrated Sunyaev-Zel'dovich (SZ) effect measurements, using the Planck all-sky cluster catalog and published radio data. The correlation agrees well with previous scaling measurements based on X-ray data, and offers a more direct probe into the mass dependence inside radio haloes. However, we find no strong indication for a bi-modal cluster population split between radio halo and radio quiet objects. We discuss the possible causes for this apparent lack of bi-modality, and compare the observed slope of the radio-SZ correlation with competing theoretical models of radio halo origin.