SIMBAD references

2019MNRAS.487.4775B - Mon. Not. R. Astron. Soc., 487, 4775-4789 (2019/August-3)

A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959.

BIRZAN L., RAFFERTY D.A., CASSANO R., BRUNETTI G., VAN WEEREN R.J., BRUGGEN M., INTEMA H.T., DE GASPERIN F., ANDRADE-SANTOS F., BOTTEON A., ROTTGERING H.J.A. and SHIMWELL T.W.

Abstract (from CDS):

The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, we present new detections of both a radio halo (with a spectral index of α1431400=1.48+0.06–0.23) and a likely radio relic in Abell 959, a massive cluster at a redshift of z = 0.288. Using a sample of clusters with giant radio haloes from the literature (80 in total), we show that the radio halo in A959 lies reasonably well on the scaling relations between the thermal and non-thermal power of the system. Additionally, we find evidence that steep-spectrum haloes tend to reside in clusters with high X-ray luminosities relative to those expected from cluster luminosity-mass(LM) scaling relations, indicating that such systems may preferentially lie at an earlier stage of the merger, consistent with the theory that some steep-spectrum haloes result from low-turbulence mergers. Lastly, we find that halo systems containing radio relics tend to lie at lower X-ray luminosities, relative to those expected from cluster LM scaling relations, for a given halo radio power than those without relics, suggesting that the presence of relics indicates a later stage of the merger, in line with simulations.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: clusters: individual: A959 - galaxies: clusters: intracluster medium - large-scale structure of Universe - radio continuum: galaxies - X-rays: galaxies: clusters

Simbad objects: 114

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2019.12.11-14:35:54

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