From filament to clumps and cores - A multiscale study of fragmentation and the role of the magnetic field and gas velocity in the infrared dark cloud SDC18.624-0.070

Open Access

Table B.1

Structure function fit parameters.

Filament parameters - 10 pc scale
Object	$\frac{〈 B_{t}^{2} 〉}{〈 B_{0}^{2} 〉}$ $\frac{\langle B_t^2 \rangle}{\langle B_0^2 \rangle}$	δ (pc)	a (10⁻⁷arcsec⁻²)

SDC18	0.16±0.02	0.43±0.04	2.69±0.27

Filament-embedded clumps parameters 1 pc scale^a

Object	$\frac{〈 B_{t}^{2} 〉}{〈 B_{0}^{2} 〉}$ $\frac{\langle B_t^2 \rangle}{\langle B_0^2 \rangle}$	δ (pc)	a (10⁻⁷arcsec⁻²)

SDC18-N	-	-	-
SDC18-S	-	-	-

Isolated clumps parameters - 0.1 pc scale

Object	$\frac{〈 B_{t}^{2} 〉}{〈 B_{0}^{2} 〉}$ $\frac{\langle B_t^2 \rangle}{\langle B_0^2 \rangle}$	δ (pc)	a (10⁻⁴arcsec⁻²)
SDC18-N	0.84±0.04	0.020±0.003	-8.14±5.43
SDC18-S	0.28±0.19	0.020±0.019	26.3±1.00

Clump-embedded cores parameters - 0.01 pc scale

Object	$\frac{〈 B_{t}^{2} 〉}{〈 B_{0}^{2} 〉}$ $\frac{\langle B_t^2 \rangle}{\langle B_0^2 \rangle}$	δ (pc)	a (10⁻³arcsec⁻²)

SDC18-N-1	0.85±0.28	0.005±0.004	1.15±0.83
SDC18-N-3	0.56±0.43	0.009±0.002	-8.56±1.36
SDC18-S-1	0.76±0.13	0.009±0.001	1.40±2.60

Notes. Table columns: ratio of turbulent to large-scale magnetic field components $\frac{〈 B_{t}^{2} 〉}{〈 B_{0}^{2} 〉}$ $\frac{\langle B_t^2 \rangle}{\langle B_0^2 \rangle}$ , turbulence correlation length δ’, and coefficient of first-order Taylor expansion of the large-scale magnetic field structure a. The errors are from the best fits of the structure function. ^(a) Structure function method failed at 1 pc scale. Hence, the magnetic field strength is estimated with the classical DCF method (see the description in Appendix B).

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