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Fig. 13

image

Position angles of the elongated structures of the total neutral gas (blue bars), obtained from the anisotropic wavelet transform on the scale 2a = 1′, and magnetic polarization angles (red bars); the isocontour of the total gas intensity at 20% of its maximum in the arms is shown as a dashed line. The upper panel shows the data points where the difference between two angles is between and 33° with a positive value meaning a clockwise rotation with respect to the gas structure), as suggested by the relative shift of the corresponding peaks in the angular spectra (Fig. 12), while the lower panel shows the remaining data points. The axis scales are in kpc.

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