Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters

Details Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters

2001-08-30

arxiv.org/abs/astro-ph/0108485v1

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20011219

We present a correlation between X-ray surface brightness and Faraday rotation measure in galaxy clusters, both, from radio and X-ray observations as well as from modeling of the intra-cluster medium. The observed correlation rules out a magnetic field of constant strength throughout the cluster. Cosmological, magneto-hydrodynamic simulations of galaxy clusters are used to show that for a magnetic field of cosmic origin this correlation is expected and excellently reproduces the observations showing that the RMS scatter of the Faraday rotation increases linearly with the X-ray surface brightness. From the correlation between the observable quantities, rotation measure and X-ray surface brightness, we infer a relation between the physical quantities: magnetic field and gas density. For the best available observations, those of A119, we find $B \propto n_e^{0.9}$.

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