Table 2
Statistics of the stacking experiment.
| Sample | Number of sources | 3 × rms [optical depth] |
|
|
||
| Non-detections | 170 | 0.0015 |
| Compact | 72 | 0.0033 |
| Extended non-detections | 80 | 0.0027 |
| 4.6μm bright and 12μm bright non-detections | 71 | 0.0033 |
| Dust-poor non-detections | 97 | 0.0027 |
Notes. Results of the stacking experiment for the non-detections and their subsamples based on the radio classification (compact and extended sources) and on the WISE colour–colour plot (4.6μm bright, 12μm bright and dust-poor galaxies). Since no lines are detected in absorption, we provide as upper limits three times the noise level of the final stacked spectrum.
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