Do magnetic fields influence gas rotation in galaxies?

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Table 1

Observational parameters for typical spiral and dwarf galaxies (see text for details).

Galaxy	B _reg,0	B _tur,0	R _{B reg}	R _{B tur}	R _gas	R _Ω	Ω₀	V _a
	[μG]	[μG]	[kpc]	[kpc]	[kpc]	[kpc]	[Gyr^-1]	km s^-1


Spiral, high SF	8	20	20	15	5−10	1	200−250	12
Spiral, low SF	4	10	20	15	5−10	1	200−250	6
Flocculent	4	10	20	15	5−10	3	50−70	6
Dwarf, high SF	3	15	4	3	5	1	40−70	7
Dwarf, low SF	0	5	0	3	5	1	10−30	2
Large, stripped^a	8	20	20	15	2	1	200	45
Milky Way	5	11	10	10	3.1	.5	400	6.6
NGC 6946	8	20	20	15	8.7	1	180	12
M 31, R> 10 kpc	5	6	20	15	10	1	200	5

Notes. The Milky Way, NGC 6946, and M 31 are included because these are the cases with the most complete observations. gas density, ρ_gas = 1 cm^-3, otherwise ρ_gas = 15 cm^-3.

^(a)

Central

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