Ionisation in turbulent magnetic molecular clouds - I. Effect on density and mass-to-flux ratio structures

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Table 5

Filament study comparison computational features.

Study^a	This work	S14	K15	F16

Code used^b	IDL code	AREPO	FLASH v2.5	FLASH v4
Dimensions	2	3	3	3
MHD	Y	N	Y	Y
Ambipolar diffusion	Y	N	N	N
Initial Mach #	0.03 – 4	12	6.01	5^c
B field strength (μG)	2.14 or 1.18	0	56.7 or 120.5	10
Gravity	Y	Y	Y	Y
Chemistry	Y^d	Y^e	Y^f	N
Mass (M_⊙)	4000	10000	500 or 2000	388
Temperature (K)	10	10^g	10	10
Box Size (pc)	15	15^h	2	2
Resolution	512²	...ⁱ	8195³^j	1024³
Pixel size (AU)	5987	1013^k	50^l	395

Notes.

^(a)

Paper citations for study labels: S14 = Smith et al. (2014), K15 = Kirk et al. (2015), and F16 = Federrath (2016);

^(b)

references for codes are Basu & Ciolek (2004, IDL code), Springel (2010, ARPEO), and Fryxell et al. (2000, FLASH v2.5, FLASH v4);

^(c)

driven;

^(d)

via ionisation profiles;

^(e)

hydrogen chemistry of Glover & Mac Low (2007a,b) together with a highly simplified treatment of CO formation and destruction introduced in Nelson & Langer (1997);

^(f)

gas cooling by dust and molecular lines from Banerjee et al. (2006);

^(g)

average value used to calculate Jeans length;

^(h)

setup is a 7 pc radius sphere of cold gas embedded within a larger 65 pc periodic box of tenuous warm medium with temperature of several thousand Kelvin (Smith et al. 2014);

⁽ⁱ⁾

code uses Adaptive Mesh Refinement (AMR) for which resolution is not based on cell sized but rather mass within a cell. Base resolution based on this criteria is 10^-2M_⊙ ;

^(j)

code uses AMR. This value is based on smallest cell size;

^(k)

value quoted here is the radius with their standard refinement scheme;

^(l)

refers to smallest pixel size within the simulation.

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