Table 2.
Number of sources remaining in our catalogues after each selection step, beginning from the initial VISTA Y + J-selected catalogue.
| Selection step | Objects remaining | |
|---|---|---|
| Initial catalogue | 1 051 995 | |
| 5σY + J VISTA cut | 706 607 | |
| < 2σ in HSC g | 32 165 | |
| < 2σ in HSC r | 13 212 | |
| < 2σ in HSC i | 4849 | |
| SED fitting step | UltraVISTA-only | UltraVISTA + Euclid |
| Overlap with Euclid | – | 1850 |
| Initial z > 6 cut | 1872 | 403 |
| Visual selection | 751 | 341 |
| Low-z: χlow-z2 < χhigh-z2 + 4 | 718 | 333 |
| UCDs: χUCD2 < χhigh-z2 | 656 | 315 |
| 6.5 ≤ zphot ≤ 7.5, with Lyα | 289 | 140 |
Notes. The first column shows the selection step. The second column shows the number of objects remaining. For the SED fitting steps (and the visual selection), we conduct two different selections: the U-only selection, where Euclid photometry is not included, and the U + E selection, where Euclid photometry is included. In both selections, ancillary HSC and Spitzer data are also used as required. For the U + E selection, we restrict the catalogue to the 0.65 deg2Euclid footprint. The high-redshift (z > 6) cut is defined as the best-fitting SED solution having its photometric redshift z > 6, χ2 < 11.3 (U-only) or 17.5 (U + E), and Δχ2 > 4 between the low- and high-redshift solutions.
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