Strong X-ray emission from Population III stars leaves a detectable enhancement in the 21cm power spectrum at z=7-10, provided their X-ray luminosity per star formation is at least an order of magnitude above Population II.
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Semi-analytic modelling of Pop. III star formation and metallicity evolution -- II. Impact on 21cm power spectrum
Strong X-ray emission from Population III stars leaves a detectable enhancement in the 21cm power spectrum at z=7-10, provided their X-ray luminosity per star formation is at least an order of magnitude above Population II.