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Using SKA Rotation Measures to Reveal the Mysteries of the Magnetised Universe

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arxiv 1506.00808 v1 pith:ZDTPYURT submitted 2015-06-02 astro-ph.CO astro-ph.GA

Using SKA Rotation Measures to Reveal the Mysteries of the Magnetised Universe

classification astro-ph.CO astro-ph.GA
keywords cosmicfieldsmagneticuniverseastrophysicalimproveknowmeasures
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Helical radio jets as probes of magnetised cluster environments: Periodic Faraday Rotation Revealed in the Corkscrew Galaxy by POSSUM

    astro-ph.GA 2026-07 conditional novelty 6.5

    Periodic RM oscillations matching the Corkscrew jet's lateral deviations reveal a transition from jet/sheath to local-ICM Faraday media along the flow.

  2. Accurate Extragalactic Magnetic Fields from Faraday Rotation with Optimal Dispersion Measure Estimators

    astro-ph.GA 2026-07 conditional novelty 6.0

    Calibrated on MHD galaxy simulations, an EM-based power-law estimator converts Faraday rotation measures to magnetic field strengths with ~0.1 dex error.

  3. The Rapid ASKAP Continuum Survey VII: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) Second Data Release -- Unveiling the Magnetised Sky

    astro-ph.GA 2026-05 unverdicted novelty 6.0

    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.

  4. The Rapid ASKAP Continuum Survey VII: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) Second Data Release -- Unveiling the Magnetised Sky

    astro-ph.GA 2026-05 unverdicted novelty 6.0

    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}.

  5. The VLA-COSMOS 3 GHz Large Project: Polarised source counts and catalogue

    astro-ph.GA 2026-07 unverdicted novelty 4.0

    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.

  6. An SKA-Low RM Grid for constraining the origin of cosmic magnetism

    astro-ph.CO 2026-06 unverdicted novelty 4.0

    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.

  7. Tracing the Cosmic web across Cosmic time through SKA observations of radio galaxies

    astro-ph.GA 2026-07 unverdicted novelty 3.0

    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 ...

  8. Exploring the physics of ram pressure stripping with radio continuum observations in the SKA era

    astro-ph.GA 2026-06 unverdicted novelty 2.0

    Perspective on using SKA-Low and SKA-Mid radio continuum to extend ram pressure stripping studies to southern clusters and z~0.5.