Table 1.
Summary of the selection criteria used, and the number of sources left after each selection step.
| Selection step | Selection criterion | Number of sources |
|---|---|---|
| 0 | Total LoTSS catalogue | 4 396 228 |
| 1 | Isolated from other sources in 47″ radius in LoTSS | 2 676 735 |
| 2 | Unresolved in LoTSS | 2 493 574 |
| 3 | Sources classified as ‘Simple’ or ‘Multiple’ by PyBDSF | 2 493 565 |
| 4 | Master sample LoLSS and NVSS counterparts | 9768 |
| 5 | PS sample αlow ≥ 0.1 and αhigh ≤0 | 373 |
| 5a | Hard sample αlow ≥ 0.1 and αhigh ≤ − 0.5 | 212 |
| 5b | Soft sample αlow ≥ 0.1 and 0≥ αhigh ≥ − 0.5 | 161 |
Notes. The details of each selection step are provided in Sect. 3. The numbers in italics in step 5a and 5b indicate the subset of sources selected from the sample of sources in step 5. The large decrease in sources from selection step 3 to selection step 4 is caused in part by the fact that the LoLSS survey area only contains ∼20% of the total number of sources from the LoTSS catalogue.
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