Analysis of the surface brightness dimming with SSP EMILES models. Top: surface brightness magnitude dimming between z = 0.6 and z = 0 as a function of the age of the SSP model. The five different lines cover a range in metallicities from −0.96 to +0.25. The black vertical histogram represents the probability density of the observed dimming in the surface brightness at the break radius (Δμbreak) since z = 0.6 according to our observational data. Bottom: projected probability distributions for the lookback time to the SSP burst, assuming the different SSP models and the observed dimming in μbreak. We refer to the legend in the panels for a key of the different lines.
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