Linearly polarized intensity image of M 51 at 3 GHz with a resolution of 10″ × 7″ overlaid onto a Hα image (Kennicutt et al. 2003) (left) and with a resolution of 15″ in color scale in units of Jy beam−1 (right). The contours in the left panel are drawn at [8, 12, 16, 24, 32] × 6 μJy beam−1. The polarized intensity maps are overlaid with the polarization E + 90°-orientations, corrected for Faraday rotation to show the magnetic field structure. Data of the polarization orientations are only shown where the signal-to-noise ratio in polarized intensity exceeds five. The beam size is shown in the top left corner.
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