Dark matter distribution in X-ray luminous galaxy clusters with Emergent Gravity

Abstract

We present the radial distribution of the dark matter in two massive, X-ray luminous galaxy clusters, Abell~2142 and Abell~2319, and compare it with the quantity predicted as apparent manifestation of the baryonic mass in the context of the "Emergent Gravity" scenario, recently suggested from Verlinde (2016). Thanks to the observational strategy of the \xmm\ Cluster Outskirt Programme (X-COP), using the X-ray emission mapped with \xmm\ and the SZ signal in the Planck survey, we recover the gas density, temperature and thermal pressure profiles up to $\sim R_{200}$, allowing to constrain at unprecedented level the total mass through the hydrostatic equilibrium equation. We show that, also including systematic uncertainties related to the X-ray based mass modelling, the apparent "dark" matter shows a radial profile that has a shape different from the traditional dark matter distribution, with larger discrepancies (by a factor 2--3) in the inner ($r<200$ kpc) cluster's regions and a remarkable agreement only across $R_{500}$.

5 pages, 3 figures. To be published in MNRAS

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• Testing Verlinde's Emergent Gravity with the Radial Acceleration Relation
• The gravitational field of X-COP galaxy clusters
• Three problems about multi-scale modelling in cosmology
• Probing Cosmology with Dark Matter Halo Sparsity Using X-ray Cluster Mass Measurements
• Limit on graviton mass using stacked galaxy cluster catalogs from SPT-SZ, Planck-SZ and SDSS-redMaPPer
• Testing Verlinde's emergent gravity in early-type galaxies
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• Testing Emergent Gravity on Galaxy Cluster Scales
• Iron abundance distribution in the hot gas of merging galaxy clusters
• Constraining Chameleon screening using galaxy cluster dynamics
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• Testing Emergent Gravity with Optical, X-ray, and Weak Lensing Measurements in Massive, Relaxed Galaxy Clusters
• Testing generalized scalar-tensor theories of gravity with clusters of galaxies
• Geometric Support for Dark Matter by an Unaligned Einstein Ring in Abell 3827
• X-ray cluster cosmology
• The Dark Side Properties of Galaxies Requires (viable) Modifications to the Verlinde's Emergent Gravity Theory
• A test of MOND and Emergent Gravity with SMACS J0723.3-7327 using eROSITA observations