Time evolution of the shell radius for a momentum-driven outflow produced by an early SMBH accreting at its Eddington limit. Input parameters are as in Fig. 2. The black curve shows the analytic solution described by Eq. (21). The vertical dotted lines are as in Fig. 2. The two asymptotic solutions, where the shell radius scales as t1 / 2 for t ≪ tSal and et/ (4tSal) for t ≫ tSal, are also shown as dotted lines.
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