Summary of filament properties.
|Filament||Length (pc)||Orientation (°)||λcore (pc)||Width (pc)||Mline (M⊙ pc−1)||Mfil (M⊙)||τcrit (Myr)||Ṁ (M⊙ pc−1 Myr−1)||τage (Myr)|||∇V r| (km s−1 pc−1)|
|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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