Fig 6: α−1 in the medium φ 0 case is shown, where α is the lapse function. Left panel: a detailed sketch of α−1 at t = 1232.20 M ; there is no sign of a third BH in the center. Right panel: sketch of α − 1 in different timesteps, which are t = 1105.95, 1146.35, 1191.80, 1217.05, 1222.10, 1227.15, 1232.20, 1242.30, 1262.50 M respectively. The final BH is much larger than the two initial BHs. More

Fig. 7 Left panel: the orbits of the two BHs in the medium φ 0 case. Two different colors represent two BHs. Right panel: the radial position of one of the BHs as a function of time in the medium φ 0 case. The orbits gain eccentricity through the passage of the axion shell, and turn into round orbits again at the late stage of the evolution.More

Fig. 5 The Monte Carlo (MC) and on-orbit data comparison of variable RMS, only in the 65.0–75.0 GeV bin. Green: on-orbit proton; Black: on-orbit electron; Blue: MC proton; Red: MC electron.More