Detection of anti-correlation of hot and cold baryons in galaxy clusters
Mulroy, Sarah L
Evrard, August E
Smith, Graham P
Carlstrom, John E
Haines, Chris P
Marrone, Daniel P
AffiliationUniv Arizona, Steward Observ
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationFarahi, A., Mulroy, S. L., Evrard, A. E., Smith, G. P., Finoguenov, A., Bourdin, H., ... & Mazzotta, P. (2019). Detection of anti-correlation of hot and cold baryons in galaxy clusters. Nature communications, 10.
Rights© The Author(s) 2019. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractThe 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 x 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.
NoteOpen access journal
VersionFinal published version
SponsorsMcWilliams Postdoctoral Fellowship; NASA [GO8-19107B, GO6-17116B]; STFC; Royal Society; NSF [AST-1140019]; PRIN INAF 2014; ASI-INAF [2017-14-H.O]; University of Rome "Tor Vergata" Grant, "Mission: Sustainability" EnClOS