The supernova-regulated ISM - III. Generation of vorticity, helicity, and mean flows

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Table 1

Parameters and some characteristic quantities computed as volume- and time-averages over the whole computational domain.

Run	Ω	S	q	u_rms	u′rms	ω_rms	Re	\|Co\|	Δt	E_th	E_kin	A_H	A_V	SNe
	[Ω₀]	[Ω₀]		[ km s−1]	[ km s−1]	[ Gyr⁻¹]			[t_to]	[σ_SN]	[σ_SN]
4Ωp	+ 4	− 4	+ 1	46 ± 21	26 ± 21	695	103	0.75	7.8	27.2	16.7	− 0.08	0.82	6795
2Ωp	+ 2	− 2	+ 1	61 ± 33	32 ± 30	831	77	0.30	9.6	29.5	16.3	− 0.06	0.81	7179
1Ωp	+ 1	− 1	+ 1	48 ± 24	28 ± 26	722	68	0.18	8.3	28.8	14.5	− 0.02	1.14	6037
0Ω0	0	0	–	50 ± 15	28 ± 18	747	93	0.00	9.2	27.7	14.6	0.00	0.85	6897
1Ωn	− 1	− 1	− 1	87 ± 33	53 ± 34	1114	103	0.09	15.9	33.0	22.0	0.04	1.65	6371
2Ωn	− 2	− 2	− 1	107 ± 43	65 ± 48	1308	102	0.15	19.6	31.4	17.3	0.07	1.65	6164
4Ωn	− 4	− 4	− 1	96 ± 48	49 ± 35	1160	79	0.40	14.7	35.5	24.2	0.21	1.91	7871

Notes. Angular velocity Ω and shear S are in multiples of the angular velocity of our Galaxy in the solar neighborhood, Ω₀ = 25 km s−1 kpc⁻¹, with q = −S∕Ω. The Coriolis number, Co, is defined in Eq. (9), and Re by Eq. (10). Δt is the time span of the statistically steady state over which the data have been evaluated, in multiples of the run-specific turnover time, . In each case this corresponds to Δt = 300 Myr. The time-averaged total thermal, E_th , and kinetic, E_kin, energy are expressed relative to the typical energy injected per SN. The anisotropies of the velocity field A_H and A_V are defined in Eqs. (13) and (14), respectively. We also list the total number of SNe injected over Δt.

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