Redshift evolution of the average Eddington ratio (black lines), and of the duty cycle required in order to have a growth time equal to the age of the Universe (red curves). The duty cycle is computed for ϵ = 0.1 (upper lines) and 0.05 (lower lines). We have considered three SMBH masses: 106 (dotted line), 108 (solid line), and 1010M⊙ (dashed line).
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