As Fig. 23, but showing He iii. At a redshift of z ~ 2.8 (for which observations indicate that the reionization of He was completed) only 1.4% of helium is ionized to He iii in this simulation. Thus, due to their low emission rates of He ii-ionizing photons, stellar populations with Salpeter-like IMFs obviously cannot contribute significantly to the cosmic reionization of helium.
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