Population III Stars in I Zw 18
Astrophysics of Galaxies
2015-04-13 v1
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.
Keywords
Cite
@article{arxiv.1504.02742,
title = {Population III Stars in I Zw 18},
author = {Sally Heap and Jean-Claude Bouret and Ivan Hubeny},
journal= {arXiv preprint arXiv:1504.02742},
year = {2015}
}
Comments
Based on paper presented at the conference, "South by High Redshift" in Austin, Texas on 1-3 April 2015