Volume 378, Number 3, November II 2001
|Page(s)||777 - 786|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 November 2001|
Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters
Max-Planck-Institut für Astrophysik, PO Box 1317, 85741 Garching, Germany
2 Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD, UK
3 Dipartimento di Astronomia, Univ. Bologna, Via Ranzani 1, 40127 Bologna, Italy
4 Istituto di Radioastronomia CNR, Via P. Gobetti, 101 40129 Bologna, Italy
Corresponding author: K. Dolag, firstname.lastname@example.org
Accepted: 28 August 2001
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 .
Key words: magnetic fields / galaxies: clusters: general
© ESO, 2001
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