Oral Presentation
Correlation between Faraday rotation measure and X-ray flux of evolving galaxy clusters
Presenter: Alvina Yee Lian On (Mullard Space Science Laboratory, University College London)
Large-scale magnetic fields permeating the Universe are weak and difficult to be observed. Little is known about the properties of magnetic fields in cosmological voids, filaments, superclusters and even galaxy clusters. At present, magnetic fields in the intra-cluster medium are diagnosed by correlating the Faraday rotation measures and the X-ray flux emitted from the cluster. Studies have shown that the standard deviation of rotation measure and X-ray flux at every position in galaxy clusters often follow a power-law relation. In this talk, I will present results from our point-by-point calculations of rotation measures and X-ray flux of galaxy clusters from the GCMHD+ simulations, where we quantify the power-law relation and investigate its redshift dependence. Since the correlation length of magnetic fields can be derived from the rotation measure, the time-dependent relation will allow X-ray observations to determine the evolution of magnetic fields in cluster scales and beyond.
asiaa.sinica.edu.tw