CLUMP-3D: Testing ΛcDM with Galaxy Cluster Shapes

Mauro Sereno, Keiichi Umetsu, Stefano Ettori, Jack Sayers, I. Non Chiu, Massimo Meneghetti, Jesús Vega-Ferrero, Adi Zitrin

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

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.

Original languageEnglish
Article numberL4
JournalAstrophysical Journal Letters
Volume860
Issue number1
DOIs
StatePublished - 10 Jun 2018

Keywords

  • galaxies: clusters: general
  • galaxies: clusters: intracluster medium
  • gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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