Probing the dynamical state of galaxy clusters

Details Probing the dynamical state of galaxy clusters Probing the dynamical state of galaxy clusters

2007-06-05

arxiv.org/abs/0706.0696v1

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, submitted to A&A

Scientific paper

10.1051/0004-6361:20078020

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.

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