Polarized Radio Source Counts and the Evolution of Galactic Magnetism

Details Polarized Radio Source Counts and the Evolution of Galactic Magnetism Polarized Radio Source Counts and the Evolution of Galactic Magnetism

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714232h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #142.32; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Polarized radio source counts can address important unsolved problems in astrophysics such as the fundamental origin and subsequent evolution of large-scale coherent magnetic fields observed in galaxies, which remain poorly constrained by observational data.
Here we present differential source counts of polarized radio galaxies using the Australia Telescope Compact Array, where we have imaged two 3.5 square degree fields at 1.4 GHz to a depth of 20 microjanskys per beam in polarization. We discuss the nature of our faint polarized radio sources (which extend beyond z 2) using multiwavelength cross-identifications, and investigate the distribution of fractional polarization for our sources. Our polarized source counts can be used to place immediate constraints on evolutionary models of radio sources as well as the evolution of their magnetic fields with cosmic time.

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