Extended Data Fig. 1: Comparison of J1007_AGN to photometrically selected LRDs from COSMOS-Web.
From: A little red dot at z = 7.3 within a large galaxy overdensity
Left: F277W-F444W colour as a function of F444W magnitude. J1007_AGN (orange star) sits above the nominal threshold of F277W-F444W=1.5 for selecting LRDs in the COSMOS-Web sample (grey dots), while being brighter in F444W than the majority of their photometric LRDs. Right: F277-F444W colours as a function of the F444W compactness C444. The compactness is defined as the ratio of the aperture fluxes with diameters of 0″2 and 0″5. J1007_AGN (orange sttar) falls in the centre region, as expected for a source with an unresolved point spread function. The dashed grey lines refer to the compactness selection critera (C444 > 0.5 and C444 < 0.7) applied to photometrically selected LRDs67 (grey dots).
