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Table 4

Model parameters for the three molecular gas ISM phases using only PDR heating.

Component Density log(nH) log(G) log(NCO) log(NH2) Ωa C em b CNCO c MassNH2d
log[cm-3] G0 log[cm-2] log[cm-2] M

Mtot: 2 × 109 M

PDR I 3.5 2.5 17.1 21.5 1.2 0.11 0.61 2 × 109
PDR II 5.0 5.0 18.2 21.9 0.06 0.32 0.39 3 × 108
PDR III 6.0 6.0 16.7 21.2 0.006 0.57 < 0.01 6 × 106

Notes.

(a)

Ω is the beam filling factor for each ISM phase.

(b)

Cem is the fractional contribution of each ISM phase to the emission, as in Eq. (5).

(c)

CNCO is the fractional contribution of each ISM phase to the column density.

(d)

MassNH2 is the mass of each ISM phase as estimated by the column density using Eq. (4).

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