Extracting Spectral Index of Intergalactic Magnetic Field from Radio Polarizations

Abstract

We explain the large scale correlations in radio polarization in terms of the correlations of galaxy cluster/supercluster magnetic field. Assuming that the polarization correlations closely follow the spatial correlations of the background magnetic field we recover the magnetic field spectral index as -2.74$\pm$0.04.This remarkably agrees with cluster magnetic field spectral index obtained in cosmological magneto-hydrodynamic simulations. We discuss possible physical scenarios in which the observed polarization alignment is plausible.

16 pages, 8 figures

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• An Independent Measure of the Kinematic Dipole from SDSS
• A mechanism to explain Galaxy alignment over a range of scales
• Probing Cosmology beyond $\Lambda$CDM using the SKA
• Matter Dipole and Hubble Tension due to Large Wavelength Perturbations