Population III Stars in I Zw 18
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.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2015
- DOI:
- 10.48550/arXiv.1504.02742
- arXiv:
- arXiv:1504.02742
- Bibcode:
- 2015arXiv150402742H
- Keywords:
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- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Based on paper presented at the conference, "South by High Redshift" in Austin, Texas on 1-3 April 2015