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Date and Time of the Query: 2019-07-22 T05:58:44 PDT
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For refcode 2001A&A...378..777D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...378..777D Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters K. Dolag, S. Schindler, F. Govoni and L. Feretti Max-Planck-Institut fur Astrophysik, PO Box 1317, 85741 Garching, Germany Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD, UK Dipartimento di Astronomia, Univ. Bologna, Via Ranzani 1, 40127 Bologna, Italy Istituto di Radioastronomia CNR, Via P. Gobetti, 101 40129 Bologna, Italy Received 1 August 2001/Accepted 28 August 2001 Abstract. 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 is proportional to n_e_^0.9^. Key words: magnetic fields - galaxies: clusters: general
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