Table 4.
Contamination fraction and completeness for various (IE − YE) & (YE − JE) colour cuts applied to all sources with an IE and/or YE flux measurement in the UltraVISTA-like bright sample.
| Colour cut | Euclid | Euclid | Euclid | Euclid | Euclid | Euclid | Euclid | Euclid | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (IE − YE) | +H20 | +Rubin | +Rubin | +Spitzer | +Rubin | +Rubin | +H20 | |||||||||
| MYAMP (YE − JE) | DDF | +Spitzer | DDF | +Spitzer | ||||||||||||
| +Spitzer | ||||||||||||||||
| 2.0 & 1.4 | 0.10 | 90% | 0.05 | 90% | 0.08 | 91% | 0.01 | 94% | 0.06 | 91% | 0.05 | 94% | 0.0 | 93% | 0.04 | 90% |
| 2.6 & 1.4 | 0.05 | 86% | 0.03 | 85% | 0.03 | 86% | 0.01 | 89% | 0.03 | 85% | 0.03 | 86% | 0.00 | 86% | 0.03 | 85% |
| 2.8 & 1.4 | 0.01 | 81% | 0.01 | 81% | 0.01 | 81% | 0.00 | 82% | 0.01 | 78% | 0.01 | 79% | 0.00 | 78% | 0.01 | 77% |
| 3.4 & 0.9 | 0.00 | 58% | 0.00 | 59% | 0.00 | 58% | 0.00 | 59% | 0.00 | 55% | 0.00 | 55% | 0.00 | 55% | 0.00 | 55% |
Notes. Contamination fraction and completeness for four different (IE − YE) & (YE − JE) colour cuts, in eight scenarios of Euclid (+ancillary) photometry, once applied to all sources that have a IE and/or YE flux measurement. The colour cuts are listed in the first column, while the other columns correspond to the different data combinations. In these eight columns, we show the fraction of intermediate-z interlopers amongst the apparent z > 6 galaxy sample after applying the colour cut (on the left) and the percentage of fiducial z > 6 galaxies correctly identified as high-z sources that survive the cut (on the right). The colouring of the rows in this table is equal to how the colour selection criteria are plotted with coloured, dashed lines in Fig. 5.
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