A cluster of Population III stars at the upper limit of standard formation models, rather than an accreting black hole, powers the He II emission in the primordial object Hebe.
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What is Powering the Enigmatic He II Emitter Hebe: The First Stars or Black Holes?
A cluster of Population III stars at the upper limit of standard formation models, rather than an accreting black hole, powers the He II emission in the primordial object Hebe.