Hot gas and magnetic arms of NGC 6946: Indications for reconnection heating?

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Table 11

Derived parameters of the hot gas in and above the spiral arm regions of NGC 6946.

Region	(n_diskη^-0.5)^a	()^a	()^a	()^a	(τ^haloη^0.5)^a
	[10^-3 cm^-3]	[10⁶M_⊙]	[10⁵⁴ erg]	[10^-12 erg cm^-3]	[Myr]

A_disk	4.13	1.14	2.39	7.25	517
A_halo	1.69	4.68	3.75	1.14	579
E_disk	2.92	1.05	2.41	5.62	815
E_halo	1.26	4.53	3.89	0.91	809
G_disk	4.63	2.15	4.79	8.70	498
G_halo	2.15 ± 0.01	9.96 ± 0.07	7.70	1.40 ± 0.11	448
H_disk	3.65	3.19	6.21	5.95	524
H_halo	1.31	11.44	9.18	0.88	752

Notes. The columns are the region name, electron number density, total gas mass, total thermal energy, thermal energy density, and cooling time.

^(a)

η is the volume filling factor.

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