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Table 5

Model parameters for the three ISM phases for each of the three cases.

Component Density log(nH) log(G) log(NCO) log(NH2) α Ω a C em b C N CO c MassNH2d
log[cm-3] G0 log[cm-2] log[cm-2] % M⊙
Case 1 Mtot: 3 × 109 M⊙
PDR I 3.5 2.5 17.1 21.5 0 0.9 0.05 0.19 2 × 109
PDR II 4.5 4.0 18.2 21.9 0 0.3 0.29 0.81 1 × 109
mCDR I 5.0 5.5 17.2 21.0 25 0.006 0.66 < 0.01 3 × 106
Case 2 Mtot: 4 × 109 M⊙
PDR I 3.5 2.5 17.1 21.5 0 1.2 0.11 0.50 2 × 109
PDR II 5.0 5.5 14.9 21.2 0 1.2 0.40 0.003 1 × 109
XDR I 5.0 51.0e 19.4 23.4 0 0.006 0.48 0.50 1 × 109
Case 3 Mtot: 3 × 109 M⊙
PDR I 3.5 2.5 17.1 21.5 0 1.2 0.06 0.97 2 × 109
PDR II 4.5 4.5 15.5 21.4 0 0.8 0.07 0.02 1 × 109
mPDR I 4.5 6.0 15.7 19.5 25 0.3 0.87 < 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).

(e)

Units of XDR radiation field (FX) are [erg s-1 cm-2].

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