Table 1
Parameters of the high-velocity compact molecular clouds.
| Designation | r[pc] | Δ V [km s−1 ] | M[M⊙ ] | Mvir [M⊙] | Ek [erg] | tage [yr] | ρ [g cm−3] | Ref. |
|---|---|---|---|---|---|---|---|---|
| CO 0.02−0.02 | 3.5 | 100 | 9 × 104 | 8.1 × 106 | 1.3 × 1051 | 7 × 104 | 1.43 × 10−19 | 1 |
| CO 1.28+0.06 | 8 | 100 | ≈4 × 104 | 1.9 × 107 | 6 × 1050 | 1.6 × 105 | 5.31 × 10−21 | 2 |
| CO 2.88+0.08 | 5 | 80 | ≈104 | 7.4 × 106 | 1050 | 1.2 × 105 | 5.44 × 10−21 | 2 |
| CO 3.34+0.43 | 8 | 30 | ≈4 × 104 | 1.7 × 106 | 5 × 1049 | 5.3 × 105 | 5.31 × 10−21 | 2 |
| CO 0.40−0.22 | 5 | 100 | 4000 | 1.2 × 107 | 6 × 1049 | 105 | 2.18 × 10−21 | 3 |
| HCN 0.009−0.044 | 0.37 | 20 | 16 | 3.4 × 104 | 1046 | 3.7 × 104 | 2.51 × 10−20 | 4 |
| HCN 0.085−0.094 | 0.33 | 40 | 13 | 1.2 × 105 | 3 × 1046 | 1.6 × 104 | 2.46 × 10−20 | 4 |
Notes. Approximate sign in the mass column indicates that a line-based mass estimate was not available. In these cases, mass was estimated by multiplying the volume of the cloud with the average density of the line-emitting gas (104.5 cm−3) times a reasonable filling factor 0.1. r is the size of the cloud, ΔV is the velocity dispersion, and M is the mass. The virial mass was calculated using the relation Mvir = GΔV 2 × r. The kinetic energy was calculated using the relation 
. The age was calculated using tage = r∕Δv. The references are (1) Oka et al. (1999), (2) Tokuyama et al. (2017), (3) Oka et al. (2015), and (4) Takekawa et al. (2017).
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