2006/08/15 by A. Vikhlinin, Alexey Vikhlinin, Vikhlinin, Alexey +4
Mathematics · Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics (astro-ph) #Cluster (spacecraft) #Computational physics #Cosmology #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Mathematics #Observable #Physics #Proxy (statistics) #Quantum mechanics #Redshift #Statistics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0608330
8 pages. Invited talk, to appear in the proceedings of the XLIst Rencontres de Moriond, XXVIth Astrophysics Moriond Meeting: "From dark halos to light", L.Tresse, S. Maurogordato and J. Tran Thanh Van, Eds
arxiv created 2006/08/15 · openalex publication_date 2006/08/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
This presentation is a Moriond version of our recent paper (Kravtsov, Vikhlinin & Nagai astro-ph/0603205) where we discussed X-ray proxies for the total cluster mass, including the spectral temperature (Tx), gas mass measured within r500 (Mg), and the new proxy, Yx, which is a simple product of Tx and Mg. We use mock Chandra images constructed for a sample of clusters simulated with high resolution in the concordance LambdaCDM cosmology. The simulated clusters exhibit tight correlations between the considered observables and total mass. The normalizations of the M500-Tx, Mg-Tx, and M500-Yx relations agree to better than =~ 10-15% with the current observational measurements of these relations. Our results show that Yx is the best mass proxy with a remarkably low scatter of only =~ 5-7% in M500 for a fixed Yx, at both low and high redshifts and regardless of whether clusters are relaxed or not. In addition, we show that redshift evolution of the Yx-M500 relation is close to the self-similar prediction, which makes Yx a very attractive mass indicator for measurements of the cluster mass function from X-ray selected samples.