Table 6.
Fit results of the sinusoidal azimuthal variation of RM between λ6.2 cm and λ3.6 cm at 3′ HPBW, averaged in sectors of 10° width, in five radial rings ΔR in the galaxy plane.
| ΔR | RMfg | RMmax, a | ξreg | χ2 | ξord |
|---|---|---|---|---|---|
| [kpc] | [rad m−2] | [rad m−2] | [°] | [°] | |
| 7 − 8 | −128 ± 7 | 93 ± 13 | −4 ± 5 | 2.9 | −30 ± 5 |
| 8 − 9 | −118 ± 5 | 99 ± 10 | −9 ± 3 | 2.3 | −29 ± 4 |
| 9 − 10 | −121 ± 5 | 120 ± 9 | −7 ± 3 | 2.4 | −26 ± 3 |
| 10 − 11 | −130 ± 4 | 123 ± 8 | −7 ± 2 | 1.1 | −27 ± 2 |
| 11 − 12 | −130 ± 6 | 129 ± 11 | −5 ± 3 | 1.8 | −27 ± 3 |
Notes. Columns are: foreground RMfg; amplitude RMmax, a; phase, corresponding to the average pitch angle ξreg of the regular field in the radial ring, and reduced χ2 of the fit. The last column gives the average pitch angle ξord of the ordered field, calculated from the B orientations, corrected for Faraday rotation, and averaged over all azimuthal angles of the radial ring. The uncertainty of ξord is the error of the mean for the 36 sectors; the rms variation is about 6 times larger.
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