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Table 8

Average pitch angles of spiral arm structures of polarised intensity and magnetic pitch angles of the ordered field of NGC 628.

Spiral feature Azimuthal range (°) Radial range () Morphological pitch angle (°) Magnetic pitch angle (°)

1A 264–344 0.22–1.04 +25 ± 2 +50 ± 8
1B 310–402 0.72–0.98 +9 ± 1 +40 ± 7
1C 336–76 0.66–1.38 +20 ± 2 +32 ± 10
1D 114–210 1.34–1.36 +2 ± 2 +27 ± 8
2 118–206 0.26–1.18 +30 ± 3 +42 ± 8
3A 162–244 0.26–0.86 +23 ± 2 +43 ± 7
3B 244–284 0.86–1.42 +40 ± 2 +43 ± 7
3C 284–324 1.42–1.76 +24 ± 2 +46 ± 9

Notes. Note that the pitch angle is positive for a spiral that is winding outwards in the counter-clockwise sense.

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