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Table 2

Faraday screen parameters for the western shell of the W4 superbubble.

Column No. 9 10 11 12 13 14 15 16

(l, b) 13286, 476 13281, 478 13276, 479 13271, 481 13267, 482 13262, 484 13257, 486 13252, 487
Best fit (f, c, ψs) (0.95, 0.85, 19°) (0.78, 0.85, 25°) (0.95, 0.91, 59°) (0.68, 0.87, 64°) (0.51, 0.85, 69°) (0.61, 0.88, 68°) (0.39, 0.86, 28°) (0.59, 0.85, 13°)
f 0.77 ± 0.15 0.77 ± 0.14 0.70 ± 0.19 0.80 ± 0.13 0.54 ± 0.28 0.49 ± 0.28 0.26 ± 0.19 0.82 ± 0.12
c 0.86 ± 0.02 0.87 ± 0.02 0.90 ± 0.02 0.88 ± 0.02 0.87 ± 0.02 0.88 ± 0.02 0.88 ± 0.02 0.86 ± 0.01
ψs (deg) 18 ± 3 20 ± 3 64 ± 4 64 ± 3 66 ± 6 65 ± 8 19 ± 10 16 ± 2
RM (rad m-2) 80 ± 13 89 ± 13 286 ± 18 286 ± 13 295 ± 27 290 ± 36 85 ± 45 71 ± 9

6cm Iobs (mK Tb) 6.2 7.4 8.7 9.4 8.6 6.5 3.9 2.3
EM (pc cm-6) 47 56 66 71 65 49 30 17
Path length (pc) 25 27 31 37 61 52 40 23
fne = 0.4
ne (cm-3) 2.2 2.3 2.3 2.2 1.6 1.5 1.4 1.4
B// (μG) 4.6 ± 0.8 4.5 ± 0.7 12.3 ± 1.0 10.9 ± 0.7 9.1 ± 1.0 11.2 ± 1.5 4.8 ± 2.5 7.0 ± 1.0
fne = 1.0
ne (cm-3) 1.4 1.4 1.5 1.4 1.0 1.0 0.9 0.9
B// (μG) 2.9 ± 0.5 2.8 ± 0.4 7.8 ± 0.6 6.9 ± 0.5 5.8 ± 0.6 7.1 ± 1.0 3.0 ± 1.6 4.4 ± 0.6

If the 12th column is taken as
the longest path length
fne = 0.4
ne (cm-3) 1.9 1.9 1.9 1.6 1.6 1.5 1.4 1.4
B// (μG) 3.9 ± 0.7 3.8 ± 0.6 10.4 ± 0.9 8.0 ± 0.5 9.1 ± 1.0 11.2 ± 1.5 4.8 ± 2.5 7.0 ± 1.0
fne = 1.0
ne (cm-3) 1.2 1.2 1.2 1.0 1.0 1.0 0.9 0.9
B// (μG) 2.5 ± 0.4 2.4 ± 0.4 6.6 ± 0.5 5.1 ± 0.3 5.8 ± 0.6 7.1 ± 1.0 3.0 ± 1.6 4.4 ± 0.6

Notes. Column numbers refer to Fig. 6. The best fit (f, c, ψs) solution has the least deviations from the λ6 cm and λ11 cm observations. We tabulate ne (1σ error = 5%) and the magnetic field component B// for filling factor fne = 0.4 and 1.0. We also list ne and B// in case the 12th column represents the longest path length (see text).

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