"The Perfect Slope": A new robust low-scatter X-ray mass indicator for clusters of galaxies

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dc.creatorVikhlinin, Alexey
dc.creatorKravtsov, Andrey V.
dc.creatorNagai, Daisuke
dc.date2006-08-15
dc.date.accessioned2026-07-07T07:19:23Z
dc.date.available2026-07-07T07:19:23Z
dc.descriptionThis 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.
dc.description8 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
dc.identifierhttps://arxiv.org/abs/astro-ph/0608330
dc.identifierhttp://arxiv.org/abs/astro-ph/0608330
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114603
dc.subjectAstrophysics
dc.title"The Perfect Slope": A new robust low-scatter X-ray mass indicator for clusters of galaxies
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