Extended Data Fig. 7: Power-law fits for observed fluxes in radio and γ − ray bands.

Upper plots fit the radio fluxes with respect to the energy \({F}_{\nu }\propto {E}_{\gamma }^{\,{\alpha }_{r}}\). Lower plots fit the gamma-ray fluxes with respect to the energy for Platz+ (ref. ¹⁷) –\(EdN/dE\propto {E}_{\gamma }^{{\alpha }_{Platz}}\), Fermi14yr – \(EdN/dE\propto {E}_{\gamma }^{\,{\alpha }_{F14}}\). The error-bars reported here for the gamma-ray data are based on the statistical uncertainties (see ‘Data and errors for SED’ in the Methods section for details). The reference frequencies are listed in the Supplementary Table 2. The error-bars reported for the radio fluxes are calculated based on the flux density calibration accuracy and beam sensitivity of the corresponding surveys, as defined in the Supplementary. The definitions of the fitting parameters are described ‘Fitting results’ in the Methods section. (a) northeastern outer outflows (R1-R2). α_r = − 1.07 ± 0.04, α_Pl = − 1.499 ± 0.004, and α_F14 = − 1.422 ± 0.008. (b) southeastern outer outflows (R3-R4). α_r = − 1.14 ± 0.11, α_Pl = − 1.415 ± 0.006, and α_F14 = − 1.344 ± 0.010. (c) southeastern Fermi Bubble cap (R5-R3). α_r = − 1.13 ± 0.22, α_Pl = − 1.239 ± 0.002, and α_F14 = − 1.144 ± 0.001.