CLUMP-3D: the lack of non-thermal motions in galaxy cluster cores

Journal
Date Issued
2021
Author(s)
Sayers, Jack
•
•
•
•
Cui, Weiguang
•
Golwala, Sunil
•
Umetsu, Keiichi
•
Yepes, Gustavo
DOI
Abstract
We report the non-thermal pressure fraction (Pnt/Ptot) 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 Pnt/Ptot 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 Pnt/Ptot 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 Pnt/Ptot and little difference in the ensemble average Pnt/Ptot 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.
Volume
505
Issue
3
Start page
4338
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.505.4338S
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

CLUMP-3D- the lack of_stab1542.pdf

Description
PDF editoriale
Size

2.63 MB

Format

Adobe PDF

Checksum (MD5)

7cf88a417deca410e92ca109450349be