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Table 2

Resulting column densities, N(N+), column density ratios with the related species C+ in the diffuse line-of-sight gas, and average ionised hydrogen volume density in the WIMa.

Source N(N+) N(C+)/N(N+)b n H+ c
(cm-2) (cm-3)

W 31C 1.5 × 1017 41 0.20−0.32
W 49N 1.6 × 1017 43 0.09−0.15
W 51 7 × 1016 15 0.09–0.14
G34.3+0.1 7 × 1016 22 0.14–0.23



Estimated over the velocity ranges listed in Table 1.


N(C+) from Gerin et al. (2012, 2014).


Assuming a volume filling fraction 0.1–0.4 (corresponding to a line-of-sight filling fraction f = 0.46–0.74 in Eq. (4) obtained from the volume filling factor raised to the 1/3 power).

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