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The Lack of Non-Thermal Motions in Galaxy Cluster Cores

Sayers, Jack and Sereno, Mauro and Ettori, Stefano and Rasia, Elena and Cui, Weiguang and Golwala, Sunil and Umetsu, Keiichi and Yepes, Gustavo (2021) The Lack of Non-Thermal Motions in Galaxy Cluster Cores. . (Unpublished)

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We report the non-thermal pressure fraction (P_(nt)/Pt_(ot)) 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 0.015-0.4R_(200m) (35-1000 kpc). At cluster-centric radii smaller than 0.1R_(200m) the ensemble average P_(nt)/Pt_(ot) is consistent with zero with an upper limit of nine 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)/Pt_(ot) increases outside of this radius to approximately 20 per cent at 0.4R_(200m), 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)/Pt_(ot) and little difference in the ensemble average P_(nt)/Pt_(ot) 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.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Sayers, Jack0000-0002-8213-3784
Sereno, Mauro0000-0003-0302-0325
Ettori, Stefano0000-0003-4117-8617
Rasia, Elena0000-0003-4175-002X
Golwala, Sunil0000-0002-1098-7174
Umetsu, Keiichi0000-0002-7196-4822
Additional Information:© 2021 The Authors. The simulations of the 300 project were performed on the Marenostrum Supercomputer of the Barcelona Supercomputing Center thanks to computing time from the “Red Española de Supercomputación". JS was supported by NSF/AAG award 1617022. GY was supported by MICIU/FEDER (Spain) grant PGC2018-094975-C21. WC was supported by European Research Council grant 670193. KU was supported by the Ministry of Science and Technology of Taiwan (grants MOST 106-2628-M-001-003-MY3 and MOST 109-2112-M-001-018-MY3) and from the Academia Sinica Investigator Award (grant AS-IA-107-M01). SE, ER, and MS were supported by contract ASI-INAF n.2017-14-H.0. SE and MS were supported by INAF mainstream project SE was supported by contract ASI-INAF Athena 2019-27-HH.0, and by the European Union’s Horizon 2020 Programme under the AHEAD2020 project (grant 871158).
Group:Astronomy Department
Funding AgencyGrant Number
Ministerio de Ciencia, Innovación y Universidades (MICIU)PGC2018-094975-C21
Fondo Europeo de Desarrollo Regional (FEDER)UNSPECIFIED
European Research Council (ERC)670193
Ministry of Science and Technology (Taipei)MOST 106-2628-M-001-003-MY3
Ministry of Science and Technology (Taipei)MOST 109-2112-M-001-018-MY3
Academia SinicaAS-IA-107-M01
Agenzia Spaziale Italiana (ASI)2017-14-H.0
Istituto Nazionale di Astrofisica (INAF)
Agenzia Spaziale Italiana (ASI)2019-27-HH.0
European Research Council (ERC)871158
Subject Keywords:galaxies: clusters: general – galaxies: clusters: intracluster medium – X-rays: galaxies: clusters – gravitational lensing: weak – gravitational lensing: strong – galaxies: active
Record Number:CaltechAUTHORS:20210406-074843845
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108625
Deposited By: Tony Diaz
Deposited On:07 Apr 2021 17:06
Last Modified:07 Apr 2021 17:06

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