A team led by Emma Giovinazzo (University of Geneva) has analyzed JWST/NIRSpec spectra of 1,428 galaxies at redshift 5 to 10 and found that cosmic reionization may have been driven by a minority of "strong leaker" galaxies. Though only about 20% of galaxies let more than 10% of their ionizing radiation escape, these produced roughly 87% of the photons that reached the intergalactic medium — enough to account for nearly all reionization by z ≈ 5.8.
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, analyzing 1,428 galaxies at redshift 5 to 10, suggests cosmic reionization was driven by a minority of "strong leaker" galaxies. Although only about 20% of galaxies let more than 10% of their ionizing radiation escape, these produced roughly 87% of the Lyman continuum photons reaching the intergalactic medium — enough to drive nearly all reionization, complete by z ≈ 5.8.){kind=link}