The deep full-stokes radio sky

A. R. Taylor1,2*, S. Bhatnagar3, J. Condon3, D. A. Green4, J. M. Stil5, P. Jagannathan5, N. Kantharia6, R. Kothes7, R. Perley3, J. Wall8 and T. Willis7
1Department of Astronomy, University of Cape Town, Cape Town, South Africa
2Department of Physics, University of the Western Cape, Cape Town, South Africa
3National Radio Astronomy Observatory, USA
4Cavendish Laboratory, University of Cambridge, Cambridge, UK
5Department of Physics and Astronomy, University of Calgary, Calgary, Canada
6National Centre for Radio Astrophysics, Pune, India
7Dominion Radio Astrophysical Observatory, National Research Council, Penticton, Canada
8Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada

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The new broad-band capabilities of large radio interferometers such as the GMRT and JVLA allow for long-integration mosaic imaging observations to create ultra-deep full-polarization images of the sky over wide frequency ranges. Achieving rms sensitivities of order 1 Jy, these observations explore the radio source population at flux densities well below the regime dominated by classical radio galaxies and Active Galactic Nuclei. We present initial results from radio sources revealed with deep mosaicking observations with the GMRT and JVLA at respectively 0.6 and 5 GHz, and evidence that the Jy sensitivity level marks the transition to detection of polarized emission from a population of sources dominated by emission from magnetic fields in the disks of starburst and normal galaxies.

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Keywords : polarization – radio continuum: galaxies – magnetic fields