Deep XMM-Newton Observations of the Most Distant SPT-SZ Galaxy Cluster

Adam B. Mantz; Steven W. Allen; R. Glenn Morris; Rebecca E. A. Canning; Matthew Bayliss; Lindsey E. Bleem; Benjamin T. Floyd; Michael McDonald

doi:10.1093/mnras/staa1581

paper

Deep XMM-Newton Observations of the Most Distant SPT-SZ Galaxy Cluster

arXiv:2006.02009 · doi:10.1093/mnras/staa1581

Abstract

We present results from a 577 ks XMM-Newton observation of SPT-CL J0459-4947, the most distant cluster detected in the South Pole Telescope 2500 square degree (SPT-SZ) survey, and currently the most distant cluster discovered through its Sunyaev-Zel'dovich effect. The data confirm the cluster's high redshift, $z = 1.71 \pm 0.02$ , in agreement with earlier, less precise optical/IR photometric estimates. From the gas density profile, we estimate a characteristic mass of $M_{500} = (1.8 \pm 0.2) \times 1 0^{14} M_{S u n}$ ; cluster emission is detected above the background to a radius of $\sim 2.2 r_{500}$ , or approximately the virial radius. The intracluster gas is characterized by an emission-weighted average temperature of $7.2 \pm 0.3$ keV and metallicity with respect to Solar of $0.37 \pm 0.08$ . For the first time at such high redshift, this deep data set provides a measurement of metallicity outside the cluster center; at radii $r > 0.3 r_{500}$ , we find it to be $0.33 \pm 0.17$ , in good agreement with precise measurements at similar radii in the most nearby clusters, supporting an early enrichment scenario in which the bulk of the cluster gas is enriched to a universal metallicity prior to cluster formation, with little to no evolution thereafter. The leverage provided by the high redshift of this cluster tightens by a factor of 2 constraints on evolving metallicity models, when combined with previous measurements at lower redshifts.

12 pages, to be published in MNRAS

Deep XMM-Newton Observations of the Most Distant SPT-SZ Galaxy Cluster

Abstract

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