# Role of intracluster supernovae in radio mini-halos in galaxy clusters

## TL;DR

This paper explores how intracluster supernovae type Ia could generate cosmic-ray electrons that contribute to the radio emission observed in galaxy cluster mini-halos, linking supernova activity to cluster radio phenomena.

## Contribution

It proposes a novel scenario where supernovae type Ia in galaxy clusters produce cosmic-ray electrons that power radio mini-halos, supported by observational consistency and energy estimates.

## Key findings

- SNIa rates are sufficient to fill hundreds of kpc with cosmic-ray electrons.
- SNIa energy can account for a significant fraction of mini-halo radio power.
- Radio properties of mini-halos are broadly consistent with the SNIa scenario.

## Abstract

A possibility of generating a population of cosmic-ray particles accelerated in supernovae typeIa (SNIa) remnants in the intracluster medium (ICM) is discussed. The presently constrained host-less SNIa rates in the clusters are found to be sufficient to fill a few hundred kpc region with cosmic-ray electrons within their typical synchrotron life-time of 100 Myr. The SNIa have already been considered potential sources of excess Fe abundance in cool-core clusters, distributed heating and turbulence in ICM. A good fraction of total radio power from mini-halos can be sourced from the SNIa energy deposited in the ICM with required energy conversion efficiency <1 per cent. The radio power estimated from low Mach number shock acceleration in SNIa remnants is consistent with the observations within the uncertainties in the estimates. Some observational properties of the radio mini-halos are broadly consistent with the SNIa scenario. It is also speculated that radio powers and possibly detections of mini-halos are linked to star formation and merger histories of the clusters.