Fig. 10.
The behaviour of the torus covering factor (L tor/L opt) as a function of redshift for the HerMES extreme starbursts with QSO-like optical SEDs. The solid black line corresponds to L tor = L bh with an assumed optical bolometric correction of 2.0 (Rowan-Robinson et al. 2009). The red line shows a relation that approximately reproduces the trend seen among the plotted population.
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