Comparisons of the observational constraints on EW0 with the models of Schaerer (2003), Raiter et al. (2010). These models show evolution of the spectral properties of stellar populations for stellar ages varying from 104 yr to 1 Gyr for the starburst SFH (left panel) and the constant SFH (right panel). Different colors correspond to six metallicities: Z = 0 (PopIII, blue), 5 × 10-6Z⊙ (cyan), 5 × 10-4Z⊙ (green), 0.02 Z⊙ (yellow), 0.2 Z⊙ (magenta), and Z⊙ (red). For each metallicity, the colored shaded regions denote EW0 ranges traced by the three three power-law IMFs: two Salpeter IMFs (1−100 M⊙ and 1−500 M⊙) and a Scalo IMF (1−100 M⊙). The horizontal gray shaded regions indicate the range of nine very large EW0 LAEs without signatures of mergers or AGNs.
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