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We probe how common extremely rapid rotation is among massive stars in theearly universe by measuring the OBe star fraction in nearby metal-poor dwarfgalaxies. We apply a new method that uses broad-band photometry to measure thegalaxy-wide OBe star fractions in the Magellanic Clouds and three more distant,more metal-poor dwarf galaxies. We find OBe star fractions of ~20% in the LargeMagellanic Cloud (0.5 Z_Solar), and ~30% in the Small Magellanic Cloud (0.2Z_Solar) as well as in the so-far unexplored metallicity range from 0.1 Z_solarto 0.2 Z_solar occupied by the other three dwarf galaxies. Our results implythat extremely rapid rotation is common among massive stars in metal-poorenvironments such as the early universe.

Massive stars in metal-poor dwarf galaxies are often extreme rotators