Detection of anti-correlation of hot and cold baryons in galaxy clusters

Arya Farahi (), Sarah L. Mulroy, August E. Evrard, Graham P. Smith, Alexis Finoguenov, Hervé Bourdin, John E. Carlstrom, Chris P. Haines, Daniel P. Marrone, Rossella Martino, Pasquale Mazzotta, Christine O’Donnell and Nobuhiro Okabe
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Arya Farahi: University of Michigan
Sarah L. Mulroy: University of Birmingham
August E. Evrard: University of Michigan
Graham P. Smith: University of Birmingham
Alexis Finoguenov: University of Helsinki
Hervé Bourdin: Harvard Smithsonian Centre for Astrophysics
John E. Carlstrom: University of Chicago
Chris P. Haines: INAF - Osservatorio Astronomico di Brera
Daniel P. Marrone: University of Arizona
Rossella Martino: Università degli Studi di Roma “Tor Vergata”
Pasquale Mazzotta: Harvard Smithsonian Centre for Astrophysics
Christine O’Donnell: University of Arizona
Nobuhiro Okabe: Hiroshima University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract The largest clusters of galaxies in the Universe contain vast amounts of dark matter, plus baryonic matter in two principal phases, a majority hot gas component and a minority cold stellar phase comprising stars, compact objects, and low-temperature gas. Hydrodynamic simulations indicate that the highest-mass systems retain the cosmic fraction of baryons, a natural consequence of which is anti-correlation between the masses of hot gas and stars within dark matter halos of fixed total mass. We report observational detection of this anti-correlation based on 4 elements of a 9 × 9-element covariance matrix for nine cluster properties, measured from multi-wavelength observations of 41 clusters from the Local Cluster Substructure Survey. These clusters were selected using explicit and quantitative selection rules that were then encoded in our hierarchical Bayesian model. Our detection of anti-correlation is consistent with predictions from contemporary hydrodynamic cosmological simulations that were not tuned to reproduce this signal.

Date: 2019
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DOI: 10.1038/s41467-019-10471-y

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