Extended Data Fig. 4: Best-fit SEDs of MACS1149-JD1 with various SFHs.
From: The onset of star formation 250 million years after the Big Bang
a, b, Best-fit SEDs obtained with a single stellar component, assuming an exponentially declining (a) and a constant (b) SFH. c, d, Best-fit SEDs obtained with two stellar components, assuming a constant SFH. The star formation duration of the old component is τ = 10 Myr (c) and 200 Myr (d). The reduced χ2 value, \({\chi }_{\nu }^{<mml:mpadded xmlns:xlink="http://www.w3.org/1999/xlink" lspace="-.15em">2</mml:mpadded>}\), and the best-fit stellar age for each model is shown in the upper left corner. The meanings of the symbols are the same as those in Fig. 2.
