SIMBAD references

2022MNRAS.512.4210R - Mon. Not. R. Astron. Soc., 512, 4210-4230 (2022/May-3)

A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec 'mini'-halo in a sloshing cool-core cluster.

RISELEY C.J., RAJPUROHIT K., LOI F., BOTTEON A., TIMMERMAN R., BIAVA N., BONAFEDE A., BONNASSIEUX E., BRUNETTI G., ENSSLIN T., DI GENNARO G., IGNESTI A., SHIMWELL T., STUARDI C., VERNSTROM T. and VAN WEEREN R.J.

Abstract (from CDS):

Radio mini-haloes are poorly understood, moderately extended diffuse radio sources that trace the presence of magnetic fields and relativistic electrons on scales of hundreds of kiloparsecs, predominantly in relaxed clusters. With relatively few confirmed detections to-date, many questions remain unanswered. This paper presents new radio observations of the galaxy cluster MS 1455.0+2232 performed with MeerKAT (covering the frequency range 872-1712 MHz) and LOFAR (covering 120-168 MHz), the first results from a homogeneously selected mini-halo census. We find that this mini-halo extends for ∼590 kpc at 1283 MHz, significantly larger than previously believed, and has a flatter spectral index (α = -0.97 ± 0.05) than typically expected. Our X-ray analysis clearly reveals a large-scale (254 kpc) sloshing spiral in the intracluster medium. We perform a point-to-point analysis, finding a tight single correlation between radio and X-ray surface brightness with a super-linear slope of b_1283 MHz_ = 1.16+0.06–0.07 and b_145 MHz_ = 1.15+0.09–0.08; this indicates a strong link between the thermal and non-thermal components of the intracluster medium. Conversely, in the spectral index/X-ray surface brightness plane, we find that regions inside and outside the sloshing spiral follow different correlations. We find compelling evidence for multiple sub-components in this mini-halo for the first time. While both the turbulent (re-)acceleration and hadronic scenarios are able to explain some observed properties of the mini-halo in MS 1455.0+2232, neither scenario is able to account for all the evidence presented by our analysis.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: MS 1455.0+2232 - galaxies: clusters: intracluster medium - radio continuum: general - X-rays: galaxies: clusters

Status at CDS : Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 22

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2022MNRAS.512.4210R and select 'bookmark this link' or equivalent in the popup menu