Detection of polarized emission from SNR Cassiopeia A even at meter wavelengths

Wasim Raja* and Avinash A. Deshpande
Raman Research Institute, Bangalore 560 080, India

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We report detection of weak but significant linear polarization in the emission from the Supernova Remnant (SNR) Cassiopeia A (Cas A) at 327 MHz using the GMRT. Our data in full Stokes parameters, benefiting from both high angular resolution and wide spectral span, reveal up to 5% linear polarization, despite the heavy internal depolarization expected at such low radio frequencies. Surprisingly, the intrinsic position angles (PA) are found to be nearly constant across the source.

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Keywords : ISM: individual objects (Cassiopeia A) – ISM: magnetic fields – ISM: supernova remnants – techniques: polarimetric – X-rays: individual (Cassiopeia A)