Fig. 10.
Cosmic evolution of the LGRB rate and efficiency. Top panel: comoving LGRB rate density as a function of redshift for the best fitting models of the intrinsic Ep − L correlation scenarios. Bottom panel: LGRB efficiency η(z) as as function of redshift obtained with Eq. (6). The estimation of the fraction of star formation below Zth from Eq. (5) of Langer & Norman (2006) is shown, rescaled for comparison, in dashed. The shaded area represents the 95% confidence interval.
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