Fig. 2.

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Fractional flux contribution to total UV or optical flux in different mass ranges for a single-burst population with the MIST stellar evolution library, without rotation. UV light is found to be significant within the first few million years, as the contribution from massive stars quickly decreases. Intermediate-mass stars (2 M⊙ ≤ M ≤ 30 M⊙) dominate the photons across the optical wavelength from approximately 5 Myr until around 800 Myr. In the top two rows, the gray vertical lines represent the wavelengths below which photons can ionize hydrogen, singly ionize helium, and doubly ionize helium (912 Å, 504 Å, and 228 Å, respectively).
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