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Fig. 2.


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Intensity of He II/Hβ as a function of fesc(LyC) (left) and 12 + log(O/H) (right) for different SDSS stacks (circles). The left panel shows the four stacks in bins of fesc(LyC) (very strong, strong, weak, and nonleakers in blue, green, yellow, and red, respectively), and the right panel shows the nine stacks in bins of fesc(LyC) and 12 + log(O/H) (12 + log(O/H)< 8.0, 8.0–8.3, and > 8.3, in blue, green, and red, respectively). Details of the definition of stacks can be found in Table 1. x-values and horizontal error bars refer to the mean and 68% confidence intervals (bootstrap resampling) of fesc(LyC) and 12 + log(O/H) measured for each bin (Table 1). Individual sources with X-shooter observations are also shown (empty squares; LzLCS sources and five LyC emitters were analyzed in Guseva et al. 2020). Upper limits for SDSS stacks and X-shooter observations refer to 2σ limits. The right panel also shows observations (plusess) of a compilation of almost 900 star-forming galaxies from Izotov et al. (2016a) (average and standard deviation marked with a solid line and region, respectively).

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