Redshift evolution of extragalactic rotation measures

Abstract

We obtained rotation measures of 2642 quasars by cross-identification of the most updated quasar catalog and rotation measure catalog. After discounting the foreground Galactic Faraday rotation of the Milky Way, we get the residual rotation measure (RRM) of these quasars. We carefully discarded the effects from measurement and systematical uncertainties of RRMs as well as large RRMs from outliers, and get marginal evidence for the redshift evolution of real dispersion of RRMs which steady increases to 10 rad m${}^{-2}$ from $z=0$ to $z\sim 1$ and is saturated around the value at higher redshifts. The ionized clouds in the form of galaxy, galaxy clusters or cosmological filaments could produce the observed RRM evolutions with different dispersion width. However current data sets can not constrain the contributions from galaxy halos and cosmic webs. Future RM measurements for a large sample of quasars with high precision are desired to disentangle these different contributions.

9 pages, 6 figures. Accepted by MNRAS

References in corpus (4)

• Turbulence and Magnetic Fields in the Large Scale Structure of the Universe
• Strong magnetic fields in normal galaxies at high redshifts
• A Global Probe of Cosmic Magnetic Fields to High Redshifts
• A compiled catalog of rotation measures of radio point sources

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• Constraining Magnetic Fields in the Circumgalactic Medium
• Cosmic Magnetism in Centimeter and Meter Wavelength Radio Astronomy
• S-PASS/ATCA: a window on the magnetic universe in the southern hemisphere
• A compiled catalog of rotation measures of radio point sources
• FIRST winged radio galaxies with X and Z symmetry
• Evidence for strong intracluster magnetic fields in the early Universe
• Polarised radiative transfer, rotation measure fluctuations and large-scale magnetic fields
• Effects of Depolarizing Intervening Galaxies on Background Radio Emission I. Global Disk Magnetic Field