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A New Catalog of Faraday Rotation Measures and Redshifts for Extragalactic Radio Sources
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A New Catalog of Faraday Rotation Measures and Redshifts for Extragalactic Radio Sources
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We present a catalog of Faraday rotation measures (RMs) and redshifts for 4003 extragalactic radio sources detected at 1.4 GHz, derived by identifying optical counterparts and spectroscopic redshifts for linearly polarized radio sources from the NRAO VLA Sky Survey. This catalog is more than an order of magnitude larger than any previous sample of RM vs. redshift, and covers the redshift range 0 < z < 5.3 ; the median redshift of the catalog is z = 0.70, and there are more than 1500 sources at redshifts z > 1. For 3650 of these sources at Galactic latitudes |b| >= 20 degrees, we present a second catalog in which we have corrected for the foreground Faraday rotation of the Milky Way, resulting in an estimate of the residual rotation measure (RRM) that aims to isolate the contribution from extragalactic magnetic fields. We find no significant evolution of RRM with redshift, but observe a strong anti-correlation between RRM and fractional polarization, p, that we argue is the result of beam depolarization from small-scale fluctuations in the foreground magnetic field or electron density. We suggest that the observed variance in RRM and the anti-correlation of RRM with p both require a population of magnetized intervening objects that lie outside the Milky Way but in the foreground to the emitting sources.
Forward citations
Cited by 5 Pith papers
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DEFROST: Detecting Excess in Faraday Rotation thrOugh Sophisticated analysis Techniques
DEFROST algorithm disentangles Galactic and extragalactic Faraday rotation in RM catalogs, recovering extragalactic parameters within 5 sigma for sources at absolute Galactic latitude above 45 degrees.
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Magnetised CGM Gas at z~1 revealed by SPICE-RACS
A 4.5σ excess RM dispersion of 4.13 ± 0.91 rad m^{-2} is found in 191 Mg II sightlines versus controls, implying model-dependent CGM magnetic fields of 0.4-0.8 μG at projected radii 20-150 kpc and z~1.14.
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Probing Cosmic Magnetism with Rotation Measure-Squared-Galaxy Cross-Correlations
RM²–galaxy cross-correlations can isolate the magnetic field contribution from specific redshifts and may be detectable with SKA-era RM catalogs.
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Application of Bayesian Statistical Tools to SKA Telescopes Polarization Surveys to Study Magnetization of the Large-scale Structure of the Universe
Bayesian analysis of SKA Faraday rotation data can constrain magnetization in galaxy clusters using about 50,000 measurements with precise redshifts, while filaments remain challenging even with 17,000 spectroscopic r...
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Exploring the Magnetic Field Structure of the Milky Way with Pulsars in the SKA Era
SKA1 AA* and AA4 will roughly double-to-triple the known pulsar population and supply thousands of new RMs, enabling detailed 3D mapping of Galactic disk and halo magnetic fields.
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