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Fig. 17.


Simplified cartoon of a possible configuration of the magnetic field of the helical-like and bubble-like structures in NGC 4217 (marked with boxes in the RM map in the upper right). Red shaded regions show positive RM values where the field points toward the observer, blue shaded areas show negative RM values where the field points away from the observer. The colors are chosen to match the colors of the RM to the upper right and Fig. 18. The green arrows mark the magnetic field direction. a): the helical-like structure from the observer’s perspective, where the left parts point toward the observer and the right parts point away from the observer; b): a 90° rotated (around the horizontal line) version from a point of view from above, where the projected magnetic field follows a spiral pattern. c): RM of the bubble-like structures from the observer’s perspective; d): a 90° rotated (around the vertical line) model version of the bubbles, where the magnetic field points to the observer on the outer sides of the bubbles and away from the observer on the sides closer to the disk. The straight lines in panels a), c), and d) indicate the galaxy plane.

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