Table 1.
Fraction of LAEs among GRB host galaxies from the TOUGH and XHG samples.
| Sample | ftot | ff | fL | fEW0 |
|---|---|---|---|---|
| TOUGH | 23%±7% (7/31) | 28%±8% (7/25) | 39%±11% (7/18) | 17%±7% (5/30) |
| XHG | 8%±6% (3/37) | 19%±13% (3/16) | 19%±13% (3/16) | 7%±4% (2/28) |
| TOUGH + XHG | 17%±6% (9/53) | 27%±9% (9/33) | 36%±8% (9/25) | 14%±5% (6/42) |
Notes. The first column corresponds to the name of the sample: TOUGH, XHG, or merged samples without overlapping GRBs (TOUGH + XHG). ftot: fraction of LAEs among the whole sample; ff: fraction of LAEs among the sample with a flux cut of 1.12 × 10−17 erg s−1 cm−2fL: fraction of LAEs among the sample with a luminosity cut of 5.6 × 1041 erg s−1fEW0: fraction of LAEs among the sample with a rest-frame Lyα EW > 20 Å. Because the continuum is not detected, 7 LyαEW0 measurements are missing for the TOUGH sample and 11 for the XHG sample. The fractions between brackets correspond to the number of LAEs over the size of the sample after applying the corresponding cuts. The uncertainty on the percentage of LAEs is calculated with a bootstrap method (see Sect. 2.3).
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