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Fig. 4

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Maps of the normalized synchrotron polarization bars (or headless vectors) rotated by 90° toward a hypothetical external galaxy seen edge-on, as predicted by our four models of three-dimensional, X-shape + spiral magnetic fields in galactic halos. The magnetic field is supposed to be axisymmetric (m = 0), the parameters of its poloidal component have the same values as in Figs. 1 and 2, and the pitch angle is given by Eq. (65) with p0 =  −10°, p =  −90° and Hp = 3 kpc. The trace of the galactic plane is indicated by the horizontal, solid red line, and the z-axis by the vertical, dot-dashed black line. The rotated polarization bars trace the average magnetic field orientation in the plane of the sky, and their level of grey reflects the magnitude of the polarized intensity (with a logarithmic scale).

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