Table 1.
Summary of the results of SDSS stacks.
| SDSS bins | Denomination | Definition | N | fesc | 12 + log(O/H) | He II/Hβ | QHe+/QH |
|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| fesc | Very strong leakers | fesc ≥ 0.2 | 8 |  |
 |
0.016 ± 0.007 | 0.005 ± 0.002 |
| Strong leakers | 0.05 ≤ fesc < 0.2 | 13 |  |
 |
0.013 ± 0.006 | 0.007 ± 0.003 | |
| Weak leakers | fesc < 0.05 | 29 |  |
 |
0.012 ± 0.004 | 0.007 ± 0.002 | |
| Non-leakers | S/N(LyC) < 2 | 39 | < 0.011 |  |
0.015 ± 0.005 | 0.009 ± 0.003 | |
| fesc and metallicity | fesc ≥ 0.05 and 12 + log(O/H)< 8.0 | 11 |  |
 |
0.020 ± 0.005 | 0.008 ± 0.002 | |
| fesc ≥ 0.05 and 12 + log(O/H)=8.0 − 8.3 | 6 |  |
 |
0.013 ± 0.006 | 0.006 ± 0.003 | ||
| fesc ≥ 0.05 and 12 + log(O/H)> 8.3 | 4 |  |
 |
< 0.011 | < 0.006 | ||
| fesc < 0.05 and 12 + log(O/H)< 8.0 | 9 |  |
 |
< 0.016 | < 0.009 | ||
| fesc < 0.05 and 12 + log(O/H)=8.0 − 8.3 | 15 |  |
 |
0.015 ± 0.004 | 0.008 ± 0.002 | ||
| fesc < 0.05 and 12 + log(O/H)> 8.3 | 5 |  |
 |
< 0.023 | < 0.013 | ||
| S/N(LyC) < 2 and 12 + log(O/H)< 8.0 | 6 | < 0.027 |  |
0.030 ± 0.009 | 0.017 ± 0.005 | ||
| S/N(LyC) < 2 and 12 + log(O/H)=8.0 − 8.3 | 22 | < 0.008 |  |
0.011 ± 0.004 | 0.006 ± 0.002 | ||
| S/N(LyC) < 2 and 12 + log(O/H)> 8.3 | 11 | < 0.009 |  |
< 0.013 | < 0.007 | ||
Notes. Columns (1), (2), and (3): Groups, denomination, and definition of each bin. Column (4): Number of sources in each bin. Columns (5) and (6): mean and 68% confidence intervals (bootstrap resampling) of fesc and 12 + log(O/H) for each bin. Column (7): Observed He II/Hβ intensities. Column (8): Hardness of the ionizing spectra between 54.4 eV (He+) and 13.6 eV (H) following Eq. (1) and assuming 
. Upper limits refer to a 2σ limit.
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