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Using SKA Rotation Measures to Reveal the Mysteries of the Magnetised Universe
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Using SKA Rotation Measures to Reveal the Mysteries of the Magnetised Universe
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We know that magnetic fields are pervasive across all scales in the Universe and over all of cosmic time and yet our understanding of many of the properties of magnetic fields is still limited. We do not yet know when, where or how the first magnetic fields in the Universe were formed, nor do we fully understand their role in fundamental processes such as galaxy formation or cosmic ray acceleration or how they influence the evolution of astrophysical objects. The greatest challenge to addressing these issues has been a lack of deep, broad bandwidth polarimetric data over large areas of the sky. The Square Kilometre Array will radically improve this situation via an all-sky polarisation survey that delivers both high quality polarisation imaging in combination with observations of 7-14 million extragalactic rotation measures. Here we summarise how this survey will improve our understanding of a range of astrophysical phenomena on scales from individual Galactic objects to the cosmic web.
Forward citations
Cited by 8 Pith papers
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Helical radio jets as probes of magnetised cluster environments: Periodic Faraday Rotation Revealed in the Corkscrew Galaxy by POSSUM
Periodic RM oscillations matching the Corkscrew jet's lateral deviations reveal a transition from jet/sheath to local-ICM Faraday media along the flow.
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Accurate Extragalactic Magnetic Fields from Faraday Rotation with Optimal Dispersion Measure Estimators
Calibrated on MHD galaxy simulations, an EM-based power-law estimator converts Faraday rotation measures to magnetic field strengths with ~0.1 dex error.
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The Rapid ASKAP Continuum Survey VII: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) Second Data Release -- Unveiling the Magnetised Sky
SPICE-RACS DR2 produces the largest single Faraday rotation measure catalog to date from RACS-low3 observations, with 2.5e5 RMs at 6.7 per square degree over most of the southern sky.
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The Rapid ASKAP Continuum Survey VII: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) Second Data Release -- Unveiling the Magnetised Sky
SPICE-RACS DR2 delivers the largest single Faraday rotation measure catalog from a radio survey, with 250,000-340,000 RMs across most of the sky at median uncertainty of 2 rad m^{-2}.
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The VLA-COSMOS 3 GHz Large Project: Polarised source counts and catalogue
Deep 3 GHz polarised source counts detect 65 sources (51 deg^{-2}), consistent with 1.4 GHz literature due to spectral index and depolarisation, with a 2σ upper limit of <2.0 deg^{-2} on polarised SFG density.
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An SKA-Low RM Grid for constraining the origin of cosmic magnetism
Models predict SKA-Low will deliver an RM grid of over 50,000 sources in a 10,000 deg² survey at ~0.05 rad/m² precision, at least 10x denser than current m-λ grids.
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Tracing the Cosmic web across Cosmic time through SKA observations of radio galaxies
A review/roadmap arguing that SKA observations of radio galaxies, combined with multi-wavelength redshift and cosmic-web catalogues, will let radio galaxies trace and probe the structure, magnetism, and energetics of ...
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