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Table 3
Range of densities and FUV fields consistent with the standard K99 PDR model for sources that are shown in the diagnostic plot of [C ii]/FIR vs. CO/FIR (Fig. 9).
| Objects | [C ii]/(CO 1−0) | n [cm-3] | G0 |
|
|
|||
| M 33 (N1-S1) | 1000−8000 | <104 | <103 |
| M 33 (N2-S2) | 5000−4.1 104 | – | – |
| MW-SF | 1000−5000 | 102–106 | 103−>104 |
| MW-GMCs | 500−1000 | 105–106 | 500−≳103 |
| Normal galaxies | 500−4000 | 103–106 | 102−103 |
| ULIRGs | 500−4000 | 104–106 | 103−104 |
| Starburst nuclei | ~4100 | 103–104 | 500−≳103 |
| Non-starburst nuclei | 500−4000 | 105–105 | 102−103 |
| LMC, SMC, IC 10 | 8000−105 | – | – |
Notes.For the outer regions of M 33 and for the LMC, SMC, and IC 10, the standard model fails.
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