Table 4
Assumed sets of conditions for ISM phases used to calculate [C ii]-associated gas masses, and observed H i and H2 masses.
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| CNM | WNM | PDR CO | ||||
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| Collision partner of C+ | H | H | H2 | |||
| T [K] | 80 | 8000 | 150 | |||
| n [cm-3] | 100 | 0.5 | 104 | |||
| ncrit [cm-3] | 3000 | 1600 | 6100 | |||
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| Region | M HI | M H2 | Mgas([C ii]H i, CNM) | Mgas([C ii]H i, WNM) | Mgas([C ii]CO, PDR) | |
| [105M⊙] | [105M⊙] | [105M⊙] | [107M⊙] | [105 M⊙] | ||
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| I-1 | 9.30 | 1.94 | 23.16 |
7.57 |
6.88 |
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| I-2 | 10.11 | 3.12 | 4.25 |
1.39 |
24.58 |
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| I-3 | 10.62 | 1.27 | 117.39 |
38.40 |
7.14 |
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| II | 9.36 | 3.65 | 60.36 |
19.74 |
6.44 |
|
| III | 11.20 | 2.42 | 53.33 |
17.44 |
1.13 |
|
Notes. We present the observed H i and H2 masses and compare them to theoretical values of the gas mass calculated from the H i- or H2-associated components of the [C ii] intensities under the assumption that all of the H i- or CO-associated [C ii] emits from an ISM phase with the conditions stated above. The uncertainties result from the uncertainties given in Table 3. PDR conditions are from Dimaratos et al. (2015), critical densities from Goldsmith et al. (2012).
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