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Table 11

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

Region (ndiskη-0.5)a ()a ()a ()a (τhaloη0.5)a
[10-3 cm-3] [106M] [1054 erg] [10-12 erg cm-3] [Myr]

Adisk 4.13 1.14 2.39 7.25 517
Ahalo 1.69 4.68 3.75 1.14 579
Edisk 2.92 1.05 2.41 5.62 815
Ehalo 1.26 4.53 3.89 0.91 809
Gdisk 4.63 2.15 4.79 8.70 498
Ghalo 2.15 ± 0.01 9.96 ± 0.07 7.70 1.40 ± 0.11 448
Hdisk 3.65 3.19 6.21 5.95 524
Hhalo 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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