Extended reagions of radio emission not associated with the AGN phenomenon as sources of acceleration of cosmic rays: The case of cD galaxies

TL;DR

This study investigates the presence of diffuse radio emissions like relics and halos in galaxy clusters with cD galaxies, finding preliminary evidence of their absence in such environments, which impacts understanding cosmic ray acceleration.

Contribution

It provides the first observational evidence suggesting that galaxy clusters with cD galaxies lack extended radio emissions associated with cosmic ray acceleration.

Findings

No diffuse radio relics or halos detected in the sample

Preliminary evidence of absence of such formations in cD galaxy clusters

Implications for cosmic ray acceleration mechanisms

Abstract

Diffuse, non-thermal extended emission not associated with the AGN phenomenon, found in many clusters of galaxies hosted by an AGN, are related to the acceleration of cosmic rays. In the current work we present preliminary evidence of absence of such formations in clusters of galaxies hosted by optically identified cD galaxies. Our subsample consists of three powerful low redshift radiogalaxies, centered in poor clusters of galaxies. We have searched for radio relics and (mini)halos which could be forming as a result of the confinement of cosmic rays by bubbles creayed by the AGN. We report on the work in progress.