Spin evolution of the SMBH, showing the spin magnitude (top panel), and the two angles defining the SMBH axis (second and third panel) and the angular momentum of the accreted gas at that particular timestep (bottom two panels). The angles are measured in the box frame, and are defined to be the same as in polar coordinates, where θjet is measured in the x − y plane of the box (shown in Fig. 1) and ϕjet is the angle with the z-axis (the line of sight in Fig. 1). Angles are measured in the range 0 ≤ θ < 360° and 0 ≤ ϕ < 180°. Discontinuous jumps from just below the upper end of the range, to just above the lower end of the range, or vice versa, are due to the cyclic nature of the coordinate system. The top three panels show both the fiducial simulation, and a second, identical simulation initiated with a higher spin value. White and grey background colours show the heating and cooling dominated regimes of the fiducial simulation.
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