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, 13388, Marseille, France), Ivan, Hubeny (University of Arizona, USA)
TL;DR
This paper provides evidence that I Zw 18 contains a pristine population of Population III stars, inferred from ultraviolet spectra showing no metal lines, indicating extremely low metallicity and the presence of primordial stars.
Contribution
It offers conclusive spectroscopic evidence for Population III stars in I Zw 18 through ultraviolet observations showing absence of metal lines.
Findings
No detectable metal lines in the UV spectrum of I Zw 18-NW.
Presence of nebular He II emission linked to pristine stellar populations.
Supports the existence of Population III stars in a nearby galaxy.
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAncient and Medieval Archaeology Studies · Ancient Mediterranean Archaeology and History · Classical Antiquity Studies