Table 3
Global properties of the MDCs derived from single dish continuum and N2H+ line observations, and predictions for the star formation activity of a protocluster with a normal IMF and SFE = 30%.
| Name | M SD a | Sizea | ⟨ nH2 ⟩ a | σ turb | ΣMDC | M vir | λ J | τ ff | N ⋆ b |
c
|
λ sep |
| [M⊙] | [AU] | [cm-3] | [km s-1] | [g cm-2] | [M⊙] | [AU] | [yr] | [M⊙] | [AU] | ||
|
|
|||||||||||
| CygX-N3 | 84.0 | 20 300 | 5.29 × 105 | 0.98 | 1.45 | 54.6 | 8490 | 4.6 × 104 | 66 | 2.9 | 6150 |
| CygX-N12 | 86.0 | 20 400 | 5.33 × 105 | 0.89 | 1.47 | 45.3 | 8460 | 4.6 × 104 | 68 | 3.0 | 3420 |
| CygX-N40 | 106.0 | 33 200 | 1.52 × 105 | 0.82 | – | – | – | – | – | – | – |
| CygX-N48 | 197.0 | 27 300 | 5.10 × 105 | 1.28 | 1.88 | 125 | 8640 | 4.7 × 104 | 156 | 5.6 | 3830 |
| CygX-N53 | 85.0 | 24 000 | 3.24 × 105 | 0.76 | 1.05 | 38.9 | 10 850 | 5.9 × 104 | 67 | 2.9 | 4180 |
| CygX-N63 | 58.0 | 12 300 | 1.64 × 106 | 0.72 | 2.73 | 17.9 | 4820 | 2.6 × 104 | 46 | 2.2 | – |
Notes. The de-projected average distances λsep between the PdBI fragments is also provided.
Mass, size, and average densities derived from single-dish observations by Motte et al. (2007). The average densities are however derived here in slightly different volumes than in Motte et al. (2007), inside R90 as for the fragments (see Sect. 3.3).
It includes all stars and brown dwarfs from 0.01 to 120 M⊙, among which 63% are stars (above 0.08 M⊙).
Maximum stellar mass expected for a normal IMF for a global SFE of 30% on the scale of the MDC (see Sect. 4.5).
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