Table 1
Coordinates, distance D, and physical parameters of IRDCs, obtained from Herschel far-IR data, CO data, and near-IR/mid-IR extinction.
| Region | l | b | D | ⟨ Ndust ⟩ | ⟨ Nbulk ⟩ | ⟨ Ncont ⟩ | M dust | M ext | M IRDC | M GMC | Σdust | ||
| [°] | [°] | [kpc] | [1021 cm-2] | [1021 cm-2] | [1021 cm-2] | [104M⊙] | [104M⊙] | [104M⊙] | [105M⊙] | [M⊙/pc2] | |||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | ||||||
|
|
|||||||||||||
| G11.11-0.12 | 11.118 | −0.118 | 3.6 | 22.5 | 4.6 | 3.0 | 8.4 | − | 2.2 | 0.5 | 418 | ||
| G18.82-0.28 | 18.822 | −0.285 | 4.8 | 24.1 | 9.9 | 7.1 | 3.4 | 1.9 | 2.3 | 1.3 | 448 | ||
| G28.37+0.07 | 28.373 | 0.076 | 5.0 | 39.9 | 16.1 | 7.0 | 12.4 | 6.8 | 6.3 | 9.0 | 741 | ||
| G28.53-0.25 | 28.531 | −0.251 | 5.7 | 25.6 | 11.0 | 14.0 | 9.6 | 7.4 | 5.2 | 1.5 | 474 | ||
Notes. (1) Average H2-column density (Ndust) from Herschel far-IR data within the ellipse defining the IRDC (Simon et al. 2006b). (2) Average H2-column density from 13CO 1→0 column density (assuming that 13CO is optically thin) with N(H2) [ cm-2 ] = 4.92 × 105N(13CO) in the same ellipse and assuming an excitation temperature of 15 K. The velocity range corresponds to the bulk emission of the IRDC. For G11.11-0.12, we used 12CO 3→2 data with N(H2) [ cm-2 ] = 2.3 × N(12CO) (Strong et al. 1988) with the 12CO column density N(12CO). (3) Lower limit for the “contamination” column density from CO data, determined for all velocities lower and higher than that of the IRDC. (4) Mass M = Ndust 2 mHμAD2(π/ 180)2 [M⊙] with mH = 1.67 × 10-24 g, μ = 2.3 (mean atomic weight per molecule), within the area A [deg2] of the ellipse defining the IRDC. (5) Mass of the cloud from near-IR/mid-IR extinction, given in KT and BTK. (6, 7) Lower limit of mass of the IRDC (6) and associated GMC (7) from CO bulk emission. (8) Surface density Σdust = Mdust/A. The mass M and area A refer to the values within the ellipse defining the IRDC.
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