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Table 2
Lifetimes of starless clumps calculated for different sets of parameters.
| SFR | H83, diffuse ISM opacity | OH94, cold dense opacities | ||
| Mass of potential star | 20 M⊙ | 40 M⊙ | 20 M⊙ | 40 M⊙ |
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| Clump-mass threshold | 1065 M⊙ | 2960 M⊙ | 1065 M⊙ | 2960 M⊙ |
| Number of clumps above threshold | 14 | 3 | 6 | 1 |
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| SFR of 1 M⊙/yr | 3.3 × 105 yr | 2.0 × 105 yr | 1.4 × 105 yr | 6.6 × 104 yr |
| SFR of 3 M⊙/yr | 1.1 × 105 yr | 6.6 × 104 yr | 4.8 × 104 yr | 2.2 × 104 yr |
| SFR of 6 M⊙/yr | 5.5 × 104 yr | 3.3 × 104 yr | 2.4 × 104 yr | 1.1 × 104 yr |
Notes. Estimates are calculated using different Milky Way star formation efficiencies for opacities for both the cold ISM (Hildebrand 1983, H83) and dense but cold regions (Ossenkopf & Henning 1994, OH94).
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