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Table 5

Parameters from 30 m and APEX observations and estimates based on two hypotheses of fragmentation (thermal Jeans fragmentation and turbulent Jeans fragmentation).

Source Δυ a σ obs a T 30 m σ th σ Nth n c b λ th−J c M th−J c λ Nth−J d M Nth−J d λ cl eg M cl eg (M/l)cl eg (M/l)ATLAS fg Con.h
(km s-1) (km s-1) (K) (km s-1) (km s-1) (105 cm-3) (pc) (M) (pc) (M) (pc) (M) M pc-1 M pc-1

12 0.14 1.29 ± 0.03 1.07 0.07 1.16 0.45 291 1.57 1240 1690 ± 481
G28.34 S 3.07 ± 0.06 1.30 ± 0.03 15 0.15 1.29 ± 0.03 0.72 0.10 1.97 0.55 354 1.91 1510 788 1146 ± 326 0.63 ± 0.04
18 0.17 1.29 ± 0.03 0.54 0.12 2.99 0.63 409 2.21 1740 858 ± 244

12 0.14 0.84 ± 0.03 0.79 0.08 1.34 0.34 94.60
18530 2.01 ± 0.06 0.85 ± 0.03 15 0.15 0.84 ± 0.03 0.54 0.11 2.28 0.41 115 0.62 ± 0.04
18 0.17 0.84 ± 0.03 0.40 0.14 3.47 0.48 133

12 0.14 0.86 ± 0.04 0.85 0.08 1.30 0.34 97.10
18306 2.05 ± 0.10 0.87 ± 0.04 15 0.15 0.86 ± 0.04 0.57 0.11 2.21 0.41 118 0.64 ± 0.07
18 0.17 0.85 ± 0.04 0.43 0.14 3.36 0.47 136

12 0.14 0.88 ± 0.04 0.52 0.10 1.67 0.44 132 1.54 561 391 ± 34
18308 2.09 ± 0.09 0.89 ± 0.04 15 0.15 0.87 ± 0.04 0.35 0.14 2.83 0.53 160 1.87 681 365 265 ± 23 0.60 ± 0.07
18 0.17 0.87 ± 0.04 0.26 0.18 4.30 0.62 185 2.16 787 198 ± 17

Notes.

(a)

Measured from H13CO+ (1 → 0) in a 40′′× 40′′ region (from [20′′, 20′′] to [20′′, 20′′] offset, corresponding to ~1.5 × 105 AU) obtained from 30 m observations.

(b)

nc is measured from ATLASGAL dust emission at 870 μm.

(c)

Thermal Jeans length (λth−J) and mass (Mth−J) are predicted from ATLASGAL dust emission at 870 μm.

(d)

Turbulent Jeans length (λNth−J) and mass (MNth−J) are predicted from 30 m observations on H13CO+ (1 → 0).

(e)

The critical mass and length of cylindrical fragmentation are predicted from 30 m observations on the velocity dispersion of H13CO+ (1 → 0), Eqs. (12)–(14).

(f)

The linear mass densities at different dust temperatures (assuming TATLAS = T30 m) are predicted from ATLASGAL dust emission at 870 μm.

(g)

The values in IRDC 18306 and IRDC 18308 are not given, because the fragments in each source do not align well along the large-scale filamentary direction.

(h)

Concentration of the gas in the filamentary scale is estimated from ATLASGAL dust emission at 870 μm (temperature independent).

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