Table 4
Limits of CO excitation temperatures and optical depths.
| Source | Tex,low (K) | Tex,up (K) | τlow | X([H2]/[13CO]) |
|---|---|---|---|---|
| GMF20 | 5 | 29 | 0.05 | 3.1 × 105 |
| GMF26 | 5 | 16 | 0.11 | 3.6 × 105 |
| GMF38a | 5 | 21 | 0.08 | 3.9 × 105 |
| GMF38b | 5 | 18 | 0.10 | 4.1 × 105 |
| GMF41 | 5 | 12 | 0.26 | 4.7 × 105 |
| GMF54 | 5 | 36 | 0.04 | 5.6 × 105 |
Notes. The second and third column gives the lower limit and upper limit of the CO excitation temperature, respectively. The fourth column shows the lower limit of the optical depth estimated from the 5σ 13CO noise and the highest excitation temperature found toward each source (see also Appendix D for details). The last column gives the 13CO-to-H2 conversion factor that we have used for each source.
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