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Table 4

Properties of the ionized gas derived from its thermal emission.

θ ℒ a EM b ⟨ ne ⟩ c ⟨ Ne ⟩ d  e  e
(″) pc pc cm-6 cm-4 cm-2 K km s-1 K km s-1
21.3 269 1.7 × 104 8 6.59 × 1021 758 85.8
18 227 2.4 × 104 10 7.17 × 1021 856 113
14 177 3.9 × 104 15 8.13 × 1021 1013 100
2 25.2 1.9 × 106 280 2.15 × 1022 60.1 9.5
1.7 21.4 2.7 × 106 350 2.33 × 1022 47.1 7.3
1.61f 20.3 42.3 6.5
1.55g 19.5 39.2 6.0
1 12.6 7.7 × 106 780 3.04 × 1022 21.3 3.0

Notes. Boldfaced numbers are the expected intensities when accounting for the frequency dependent coupling of the compact H II regions to the SOFIA beam.

(a)

Scale length, averaged over spherical volume: , with and D = 3.9 Mpc.

(b)

Emission meassure, averaged over θ2: pc cm-6.

(c)

Electron density, averaged over θ2: cm-3.

(d)

Electron column density, averaged over θ2: cm-2.

(e)

Integrated [C II] and [N II] intensity assuming Te = 8000 K and an electron density of ⟨ ne ⟩ for collisional excitation. The intensity is corrected by the area filling factors min(1,θ2/ 142) and min(1,θ2/ 182) for the [C II] and [N II] beams, respectively.

(f)

Effective, aggregated diameter of the compact H II regions in the [N II] beam. ⟨ ne ⟩ and ⟨ Ne ⟩ remain unaffected and were taken from the θ = 1.7″ row.

(g)

Same as (f) but for the [C II] beam.

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