CLUMP-3D: the lack of non-thermal motions in galaxy cluster cores. Issue 3 (28th May 2021)

• Record Type: Journal Article
• Authors: Sayers, Jack; Sereno, Mauro; Ettori, Stefano; Rasia, Elena; Cui, Weiguang; Golwala, Sunil; Umetsu, Keiichi; Yepes, Gustavo
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 505:Issue 3(2021)
• Page Start: 4338
• Page End: 4344
• Publication Date: 2021-05-28
• Subjects: gravitational lensing: strong -- gravitational lensing: weak -- galaxies: active -- galaxies: clusters: general -- galaxies: clusters: intracluster medium -- X-rays: galaxies: clusters; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab1542
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We report the non-thermal pressure fraction ( P nt / P tot ) obtained from a three-dimensional triaxial analysis of 16 galaxy clusters in the CLASH sample using gravitational lensing (GL) data primarily from Subaru and HST, X-ray spectroscopic imaging from Chandra, and Sunyaev–Zel'dovich effect (SZE) data from Planck and Bolocam. Our results span the approximate radial range 0.015–0.4 R200m (∼35–1000 kpc). At cluster-centric radii smaller than 0.1 R200m the ensemble average P nt / P tot is consistent with zero with an upper limit of 9 per cent, indicating that heating from active galactic nuclei and other relevant processes does not produce significant deviations from hydrostatic equilibrium (HSE). The ensemble average P nt / P tot increases outside of this radius to approximately 20 per cent at 0.4 R200m, as expected from simulations, due to newly accreted material thermalizing via a series of shocks. Also in agreement with simulations, we find significant cluster-to-cluster variation in P nt / P tot and little difference in the ensemble average P nt / P tot based on dynamical state. We conclude that on average, even for diverse samples, HSE-derived masses in the very central regions of galaxy clusters require only modest corrections due to non-thermal motions.