paper

Evidence of sloshing-driven mini-halo formation in the cool-core cluster RXCJ1558.3-1410

arXiv:2601.08757 · doi:10.1093/mnras/stag095

Abstract

Radio mini-halos are perplexing features, typically hosted by X-ray cool-core galaxy clusters. Understanding the connection between thermal X-ray and non-thermal radio emission is key to uncovering their origin. Here, we present a multiwavelength study of the cool-core cluster RXCJ1558.3-1410 using archival Chandra X-ray and wideband uGMRT radio data (Bands 3, 4 and 5). Our improved analysis confirms a previously known X-ray cavity at 36 kpc south-east of the cluster centre and we report a new cavity at 42 kpc to the north-west. These cavities suggest that the AGN provides mechanical power of erg s, sufficient to offset radiative cooling in the ICM. We also detect a sharp surface brightness edge at 72 kpc south-east of the centre, characterised by a temperature jump and pressure continuity, consistent with a cold front, likely caused by gas sloshing from a minor merger. Our uGMRT images reveals an interesting diffuse emission surrounding the brightest cluster galaxy (BCG), with its edge spatially coinciding with the sloshing cold front and roughly with the cooling radius. Furthermore, a low star formation rate and uniform metal abundance up to the sloshing edge are consistent with the earlier findings of suppression of star formation and metallicity homogenisation by mixing core gas through sloshing. Finally, the spatial correlation between the mini-halo and the observed X-ray features indicates that ICM sloshing, rather than AGN feedback, plays a dominant role in powering the proposed radio mini-halo emission.

arXiv comment16 pages, 10 figures, accepted for MNRAS

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