Evolving Spectra of Pop III Stars : Consequences for Cosmological Reionization


We examine the significance of the first metal-free stars (Pop III) for the cosmological reionization of H I and He II. These stars have unusually hard spectra, with the integrated ionizing photon rates from a Pop III stellar cluster for H I and He II being 1.6 and 10 times stronger respectively than those from a Pop II cluster. For the currently favored… (More)

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