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

Author

Listed:
  • Arya Farahi

    (University of Michigan
    Carnegie Mellon University)

  • Sarah L. Mulroy

    (University of Birmingham)

  • August E. Evrard

    (University of Michigan
    University of Michigan)

  • Graham P. Smith

    (University of Birmingham)

  • Alexis Finoguenov

    (University of Helsinki
    Max-Planck-Institute for Extraterrestrial Physics, Giessenbachstrasse)

  • Hervé Bourdin

    (Harvard Smithsonian Centre for Astrophysics
    Università degli Studi di Roma “Tor Vergata”)

  • 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
    Università degli Studi di Roma “Tor Vergata”)

  • Christine O’Donnell

    (University of Arizona)

  • Nobuhiro Okabe

    (Hiroshima University
    Hiroshima University
    Hiroshima University)

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.

Suggested Citation

  • 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 , 2019. "Detection of anti-correlation of hot and cold baryons in galaxy clusters," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10471-y
    DOI: 10.1038/s41467-019-10471-y
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