Magnetic field dragging in filamentary molecular clouds

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Table 1

Parameters for the Serpens South and G327.3 filament: field-freezing vs. magnetic diffusion.

			Field-freezing		Magnetic diffusion

	u (km s⁻¹)	n (10⁵ cm⁻³)	M_A	$t_{br}^{(a)}$ $t_{{\rm{br}}}^{(a)}$ (Myr)	R_ad	B₀ (G)	t_ad (Myr)
Serpens South (FIL2)	${0.65}_{- 0.19}^{+ 0.45}$ $0.65_{ - 0.19}^{ + 0.45}$	${1.1}_{- 0.71}^{+ 0.90}$ $1.1_{ - 0.71}^{ + 0.90}$	${4.7}_{- 1.0}^{+ 1.6}$ $4.7_{ - 1.0}^{ + 1.6}$	${0.75}_{- 0.31}^{+ 0.35}$ $0.75_{ - 0.31}^{ + 0.35}$	$40_{- 20}^{+ 50}$ $40_{ - 20}^{ + 50}$	$67_{- 49}^{+ 120} \times 10^{- 6}$ $67_{ - 49}^{ + 120} \times {10^{ - 6}}$	${3.0}_{- 2.1}^{+ 6.6}$ $3.0_{ - 2.1}^{ + 6.6}$
G327.3 (NE1–NE2)	1^(b)	46 ± 30	3.3	0.18	16	${1.3}_{- 0.70}^{+ 0.69} \times 10^{- 3}$ $1.3_{ - 0.70}^{ + 0.69} \times {10^{ - 3}}$	0.28
	0.5^(b)	46 ± 30	3.3	0.36	16	${0.95}_{- 0.52}^{+ 0.44} \times 10^{- 3}$ $0.95_{ - 0.52}^{ + 0.44} \times {10^{ - 3}}$	0.56

Notes. ^(a)A density contrast δ = 10 has been assumed to estimate t_br in the field-freezing case (see Sect. 2). ^(b)For G327.3 two values of the flow velocity have been assumed, u = 1 km s⁻¹ and 0.5 km s⁻¹.

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