We present a search for z7 Lyman-break galaxies using the 1. 72 \, deg² near-infrared UltraVISTA survey in the COSMOS field, reaching 5\, σ depths in Y of 26. 2. We incorporate deep optical and Spitzer imaging for a full spectral energy distribution (SED) fitting analysis. We find 289 candidate galaxies at 6. 5 z 7. 5 covering -22. 6 M ₔₕ -20. 2, faint enough to overlap with Hubble Space Telescope studies. We conduct a separate selection by including complementary Euclid performance verification imaging (reaching 5\, σ depths of 26. 3), yielding 140 galaxies in 0. 65 \, deg², with 38 sources unique to this sample. We compute the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee (M^*=-21. 14^+0. 28-₀. ₂₅). We find that the shape of the UV LF is consistent with both a Schechter function and double-power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at M ₔₕ7 suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at z>9. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at J ₄ < 24. 5. Finally, we present a high-equivalent-width Lyman-α emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the Epoch of Reionisation.
Varadaraj et al. (Wed,) studied this question.
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