期刊
ASTRONOMY & ASTROPHYSICS
卷 378, 期 3, 页码 777-786出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20011219
关键词
magnetic fields; galaxies : clusters : general
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, magnetohydrodynamic 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 proportional to n(e)(0.9).
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