Volume 474, Number 3, November II 2007
|Page(s)||745 - 754|
|Section||Cosmology (including clusters of galaxies)|
|Published online||23 October 2007|
Probing the dynamical state of galaxy clusters
Zentrum für Astronomie der Universität Heidelberg, ITA, Albert-Überle-Str. 2, 69120 Heidelberg, Germany e-mail: firstname.lastname@example.org
Accepted: 5 September 2007
We show how hydrostatic equilibrium in galaxy clusters can be quantitatively probed combining X-ray, SZ, and gravitational-lensing data. Our previously published method for recovering three-dimensional cluster gas distributions avoids the assumption of hydrostatic equilibrium. Independent reconstructions of cumulative total-mass profiles can then be obtained from the gas distribution, assuming hydrostatic equilibrium, and from gravitational lensing, neglecting it. Hydrostatic equilibrium can then be quantified comparing the two. We describe this procedure in detail and show that it performs well on progressively realistic synthetic data. An application to a cluster merger demonstrates how hydrostatic equilibrium is violated and restored as the merger proceeds.
Key words: galaxies: clusters: general / X-rays: galaxies: clusters / submillimeter / gravitational lensing
© ESO, 2007
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