Table 5.
Properties of the cavities indicated in Fig. 5.
| Quantity | Cavity east | Cavity west | Total |
|---|---|---|---|
| a (kpc) | 110 | 65 | – |
| b = c (kpc) | 66 | 60 | – |
| reff (kpc) | 78 | 62 | – |
| D (kpc) | 142 | 127 | – |
| V (cm3) | 5.9 × 1070 | 2.9 × 1070 | 8.8 × 1070 |
| Ecav (erg) | 2.6 × 1061 | 1.3 × 1061 | 3.9 × 1061 |
| ts (yr) | 8.0 × 107 | 7.1 × 107 | – |
| Pcav,s (erg s−1) | 1.0 × 1046 | 5.6 × 1045 | 1.6 × 1046 |
| texp (yr) | 4.4 × 107 | 3.5 × 107 | – |
| Pcav,exp (erg s−1) | 1.9 × 1046 | 1.2 × 1046 | 3.1 × 1046 |
Notes. Cavity volumes, V, were calculated assuming a prolate ellipsoidal shape with semimajor axis a and semiminor axis b = c. Cavity powers, Pcav, were calculated as the ratio of the cavity energy, Ecav, by the cavity age, assuming 4pV of energy per cavity. The cavity age was estimated in two ways: i) as the sound crossing timescale ts = D/cs, where D is the cavity distance from the center and cs is the sound speed, and ii) as the expansion time texp = reff/cs, where reff = (ab2)1/3 is the effective radius. We considered the spectral values of temperature and pressure obtained in the second radial bin of the deprojected spectral analysis (see Table B.2), where we estimated a value of the sound speed of cs = 1740 km s−1. We note that due to projection effects the cavity volume and age estimates should be considered as lower limits.
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