Fig. 3: Photoionization diagnostic diagram for GS-10578.
From: A fast-rotator post-starburst galaxy quenched by supermassive black-hole feedback at z = 3
The emission-line ratios of our target place its ionization source firmly beyond the range that can be explained by star formation (dashed line)18. For the main target, we show the emission-line ratios from spectra integrated inside elliptical apertures (colour-coded by the semimajor axis of the aperture). The yellow circle is the eastern satellite. We show a number of samples for comparison. The contours and the small empty circles trace the distribution of galaxies at z = 0.1 (from the Sloan Digital Sky Survey (SDSS)) and z = 2 (from KLEVER)98, respectively. The sand-coloured symbols and upper limits are a sample of PSB galaxies at z = 1–2 (ref. 99). The grey star is one of the most extreme PSB galaxies in SDSS. The extreme values we find for GS-10578 are like what are found for other PSB galaxies.
