A lack of evolution in the very bright end of the galaxy luminosity function from z ≃ 8 to 10

International audienceWe utilize deep near-infrared survey data from the UltraVISTA fourth data release (DR4) and the VIDEO survey, in combination with overlapping optical and Spitzer data, to search for bright star-forming galaxies at z ≳ 7.5. Using a full photometric redshift fitting analysis applied to the ∼6 |$\, {\rm deg}^2$| of imaging searched, we find 27 Lyman break galaxies (LBGs), including 20 new sources, with best-fitting photometric redshifts in the range 7.4 5 data over a wide range in absolute UV magnitude (−23 < M_UV < −17). We postulate that the observed evolution can be explained by a lack of mass quenching at very high redshifts in combination with increasing dust obscuration within the first |${\sim}1 \, {\rm Gyr}$| of galaxy evolution