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CLUMP-3D: Testing ΛCDM with Galaxy Cluster Shapes

Journal
Date Issued
2018
Author(s)
•
Umetsu, Keiichi
•
•
Sayers, Jack
•
Chiu, I. -Non
•
•
Vega-Ferrero, Jesús
•
Zitrin, Adi
DOI
Abstract
The ΛCDM model of structure formation makes strong predictions on the concentration and shape of dark matter (DM) halos, which are determined by mass accretion processes. Comparison between predicted shapes and observations provides a geometric test of the ΛCDM model. Accurate and precise measurements needs a full three-dimensional (3D) analysis of the cluster mass distribution. We accomplish this with a multi-probe 3D analysis of the X-ray regular Cluster Lensing and Supernova survey with Hubble (CLASH) clusters combining strong and weak lensing, X-ray photometry and spectroscopy, and the Sunyaev-Zel’dovich effect (SZe). The cluster shapes and concentrations are consistent with ΛCDM predictions. The CLASH clusters are randomly oriented, as expected given the sample selection criteria. Shapes agree with numerical results for DM-only halos, which hints at baryonic physics being less effective in making halos rounder.
Volume
860
Issue
1
Start page
L4
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2018ApJ...860L...4S
Rights
open.access
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