Population III Stars in I Zw 18

Sally Heap (NASA Goddard Space Flight Center , Greenbelt , MD 20771 , USA) , Jean-Claude Bouret (Aix Marseille Universit\'e , CNRS , Laboratoire d'Astrophysique de Marseille , UMR 7326

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13388 Marseille France) Ivan Hubeny (University of Arizona

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classification 🌌 astro-ph.GA

keywords emissiongalaxyrecombinationstarsultravioletcomparableconclusivecontaining

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Ultraviolet and 21-cm observations suggest that the extremely low-metallicity galaxy, I Zw 18, is a stream-fed galaxy containing a "pocket" of pristine stars responsible for producing nebular He II recombination emission observed in I Zw18-NW. Far-UV spectra by Hubble/COS and the Far Ultraviolet Spectroscopic Explorer (FUSE) make this suggestion conclusive by demonstrating that the spectrum of I Zw 18-NW shows no metal lines like O VI 1032, 1038 of comparable ionization as the He II recombination emission.

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Population III Stars in I Zw 18

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