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

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.

Accepted in MNRAS letters; 6 pages; no figure or table

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• On energetics and progenitors of Odd Radio Circles: A causal connection with tidal disruption of stars?
• Ranking Theoretical Supernovae Explosion Models from Observations of the Intracluster Gas
• Deciphering the ultra-steep spectrum diffuse radio sources discovered in the cool-core cluster Abell~980