SIMBAD references

2001A&A...378..777D - Astronomy and Astrophysics, volume 378, 777-786 (2001/11-2)

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


Abstract (from CDS):

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 ∝ne0.9.

Abstract Copyright:

Journal keyword(s): magnetic fields - galaxies: clusters: general

Simbad objects: 12

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