Detecting Magnetic Fields in Large-Scale Structure with Radio Polarization

Details Detecting Magnetic Fields in Large-Scale Structure with Radio Polarization Detecting Magnetic Fields in Large-Scale Structure with Radio Polarization

2008-12-13

arxiv.org/abs/0812.2584v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, will be published in the proceedings of IAU Symposium 259 "Cosmic Magnetic Fields: from Planets, to Stars a

Scientific paper

10.1017/S1743921309031524

We present our attempts to detect magnetic fields in filamentary large-scale structure (LSS) by observing polarized synchrotron emission emitted by structure formation shocks. Little is known about the strength and order of magnetic fields beyond the largest clusters of galaxies, and synchrotron emission holds enormous promise as a means of probing magnetic fields in these low density regions. We report on observations taken at the Green Bank Telescope which reveal a possible Mpc extension to the Coma cluster relic. We also highlight the major obstacle that diffuse galactic foreground emission poses for any search for large-scale, low surface-brightness extragalactic emission. Finally we explore cross-correlation of diffuse radio emission with optical tracers of LSS as a means to statistically detecting magnetic fields in the presence of this confounding foreground emission.

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