Magnetic Pitch Angle

Magnetic pitch angle, Ψ(R), as a function of the galactocentric radius, R, for the spiral arms of the Whirlpool galaxy. Profiles show the far-infrared HAWC+ observations at 154 µm (blue) and the radio observations at 3 cm (green) and 6 cm (yellow). Note that the infrared and radio profiles are co-spatial in the inner part of the galaxy, but begin to deviate at around R=165 arcsec. Shading shows the uncertainty, and the black vertical dashed line shows the central beam of the observations.

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