The rotation measures of high luminosity sources as seen from the NVSS

Abstract

We re-analyse the subset of the Faraday rotation measures data from the NRAO VLA Sky Survey catalogue for which redshift and spectral index information is available, in order to better elucidate the relations between these observables. We split this subset in two based on their radio luminosity, and find that higher power sources have a systematically higher residual rotation measure, once the regular field of the Milky Way is subtracted. This rotation measure stands well above the variances due to the turbulent field of our Galaxy and measurement errors, contrarily to low power sources. The effect is more pronounced as the energy threshold becomes more restrictive. If the two sets are merged one observes an apparent evolution of rotation measure with redshift, but our analysis shows that this can be interpreted as an artifact of the different intrinsic properties of brighter sources that are typically observed at larger distances.

11 figues in 7 pages, v2 matches published version

References in corpus (12)

• The VLA Low-frequency Sky Survey
• Strong magnetic fields in normal galaxies at high redshifts
• Lower limit on the strength and filling factor of extragalactic magnetic fields
• Estimating extragalactic Faraday rotation
• Calibrating High-Precision Faraday Rotation Measurements for LOFAR and the Next Generation of Low-Frequency Radio Telescopes
• A Global Probe of Cosmic Magnetic Fields to High Redshifts
• Relativistic Pair Beams from TeV Blazars: A Source of Reprocessed GeV Emission rather than IGM Heating
• A Broadband Polarization Catalog of Extragalactic Radio Sources
• Redshift evolution of extragalactic rotation measures
• Radio galaxies and their magnetic fields out to z <= 3
• Magnetic fields in cosmology
• The Role of Plasma Instabilities in the Propagation of Gamma-Rays from Distant Blazars

Cited by in corpus (9)

• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• New limits on extragalactic magnetic fields from rotation measures
• Differences in Faraday Rotation Between Adjacent Extragalactic Radio Sources as a Probe of Cosmic Magnetic Fields
• The LOFAR view of intergalactic magnetic fields with giant radio galaxies
• Radio Polarization Properties of Quasars and Active Galaxies at High Redshifts
• SPMHD simulations of Structure Formation
• Evidence for strong intracluster magnetic fields in the early Universe
• Probing the IGMF with the next generation Cherenkov telescopes
• A lower bound on the number of cosmic ray events required to measure source catalogue correlations