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Table 1
Physical properties of NGC 253 and its superwind.
| Starburst parameters | Value |
|---|---|
| d: distance [Mpc] | 2.6a−3.9 |
| LIR: infrared luminosity [L⊙] | 1.7 × 1010 |
| SFR: star-forming rate [M⊙ yr−1] | 3 |
| β: mass loading factor | 12 |
| Ṁ: mass outflow [M⊙ yr−1] | 9 |
| Lγ(E > 200 MeV): γ-ray luminosity [erg s−1] | 4.3 × 1039 |
| Tc: temperature of the central region [K]b | 2 × 107 |
| SW region parameters | Value |
| R: radius of the SW bubble [kpc] | 5 |
| Lx: X-ray luminosity [erg s−1] | 5 × 1038 |
| Th: temperature of the gas in the bubble [K] | 3 × 106 |
| n: particle density [cm−3] | 2 × 10−3 |
| B: magnetic field [μG] | 5 |
| vA: Alfvén velocity [km s−1] | 240 |
| vs: sound speed [km s−1] | 164 |
Notes. (a) The value adopted in this paper. (b) Temperature estimated with Eq. (10) adopting β = 12 and α = 0.75.
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