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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
: 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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