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Table 3

Summary of filament properties.

Filament Length (pc) Orientation (°) λcore (pc) Width (pc) Mline (M pc−1) Mfil (M) τcrit (Myr) (M pc−1 Myr−1) τage (Myr) |∇V r| (km s−1 pc−1)
North (N) 1.32 −8.1 0.27 270 259 0.3
North-West (NW) 3.06 −25.6 0.34 ± 0.06 0.16 147 393 0.64 48.9 3.0 0.2
South-East (SE) 1.17 +145.2 0.41 ± 0.02 0.37 374 223 0.78 40.0 9.4 1.1
North-East (NE) 2.89 +18.0 0.33 ± 0.21 0.25 264 401 0.62 50.5 5.3 1.5

Notes. Column 1: filament name; Col. 2: the length of the filament spine in parsec; Col. 3: the mean orientations from the minimisation of the eigenvalues of the Hessian matrices, in degrees. The origin at 0° was defined by the north direction, and the positive values are anticlockwise; Col. 4: median core separation, excluding hub cores, quoted with their standard deviation. Given we have excluded hub centre cores, this leaves only one core in the north filament; Col. 5: mean filament width in parsec (from 2.35 times the standard deviation of each radial column density) evaluated from the regions of the filament outside the hub centre only; Col. 6: mass per unit length, evaluated from the integration of radial column density profiles outside the cloud hub; Col. 7: the total mass of the filament, including the regions that pass through the cloud hub centre; Col. 8: the lower limit on the age of the filament (Eq. (1)) (in-evaluable for the north filament given its single core); Col. 9: the accretion rate of material onto the filament during its formation. Col. 10; the time elapsed since the filament became critical; Col. 11: mean radial velocity gradient across the inner 0.2 pc filament width. Systematic errors from the kinematical distance to SDC13 (3.6 ± 0.4 kpc) and unknown filament inclination are associated to the filament lengths and mean core separations. Inclination angle affects the timescales quoted, as discussed in Sect. 5.2.

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