New giant radio sources and underluminous radio halos in two galaxy clusters

TL;DR

This study investigates the radio properties of two galaxy clusters, revealing underluminous radio halos, a candidate relic, and a peculiar galaxy, providing insights into the formation and evolution of diffuse radio sources in clusters.

Contribution

The paper presents new low-frequency and high-frequency radio observations of two clusters, identifying underluminous radio halos and peculiar features, advancing understanding of diffuse radio emission in galaxy clusters.

Findings

Both clusters host underluminous radio halos with typical spectra.

Detection of a candidate radio relic in Abell 1451.

Identification of a peculiar head-tail galaxy interacting with a shock.

Abstract

The aim of this work is to analyse the radio properties of the massive and dynamical disturbed clusters Abell 1451 and Zwcl 0634.1+4750, especially focusing on the possible presence of diffuse emission. We present new GMRT 320 MHz and JVLA 1.5 GHz observations of these two clusters. We found that both Abell 1451 and Zwcl 0634.1+4750 host a radio halo with a typical spectrum ($\alpha\sim1-1.3$). Similarly to a few other cases reported in the recent literature, these radio halos are significantly fainter in radio luminosity with respect to the current radio power-mass correlations and they are smaller than classical giant radio halos. These underluminous sources might contribute to shed light on the complex mechanisms of formation and evolution of radio halos. Furthermore, we detected a candidate radio relic at large distance from the cluster center in Abell 1451 and a peculiar head tail radio galaxy in Zwcl 0634.1+4750, which might be interacting with a shock front.