Table 3
Cross-match parameters and figures.
| Survey | Max. cross-match | Survey flux | Max. major | Min. distance to | Flux product | N |
|---|---|---|---|---|---|---|
| radius | dens. limit | axis size | nearest neighbour | threshold | ||
| (arcsecs) | (mJy) | (arcsecs) | (arcsecs) | (mJy) | ||
| VLSSr | 10 | 530 | 25 | 60 | 318 | 13 |
| TGSS | 5 | 65 | 20 | 60 | 64 | 74 |
| 6C | 15 | 100 | 20 | 60 | 49 | 12 |
| GMRT 325 MHz | 8 | 1.2 | 20 | 40 | 0.8 | 115 |
| WENSS | 6 | 5.5 | 10 | 10 | 29 | 139 |
| GMRT 610 MHz | 10 | 0.6 | 10 | 10 | 1.8 | 338 |
| NVSS | 10 | 2 | 15 | 20 | 11 | 338 |
| FIRST | 4 | 2 | 10 | 10 | 11 | 310 |
Notes. Parameters used for the cross-match with external surveys and their filtering. The columns are the following: (i) Survey name. (ii) Maximum cross-match distance for the survey. (ii) Survey completeness limit. (iii) Maximum size of the major axis used for filtering. (iv) Minimum distance to the nearest neighbour LOFAR source used for filtering the isolated sources. (v) Value of the selection threshold in the product of the flux densities (see text). (vi) Number of sources selected after the cross-match and filtering.
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