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Did very massive stars preenrich and reionize the universe?

Oh, S. Peng and Nollett, Kenneth M. and Madau, Piero and Wasserburg, G. J. (2001) Did very massive stars preenrich and reionize the universe? Astrophysical Journal Letters, 562 (1). L1-L14. ISSN 2041-8205. doi:10.1086/337996.

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Recent studies of heavy r-process elements in low-[Fe/H] halo stars have suggested that an initial population of metal-free very massive stars (VMSs) may be required to provide early Fe enrichment without coproducing heavy r nuclei. We find similar abundance trends in α-elements (which should be copiously produced by VMSs) but not in other elements such as carbon (which should not), in agreement with this hypothesis. We then combine the corresponding level of prompt initial enrichment with models of VMS nucleosynthetic yields and spectra to estimate the corresponding ionizing fluxes. The result suggests that there may have been enough VMS activity to reionize the universe. The unusually hard spectrum of VMSs would imply a different reionization history from canonical models. He II could have been reionized at high redshift only to recombine as a subsequent generation of stars formed with a "normal" initial mass function.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper DOIArticle
Wasserburg, G. J.0000-0002-7957-8029
Alternate Title:Did Very Massive Stars Pre-enrich and Reionize the Universe?
Additional Information:© 2001 The American Astronomical Society. Received 2001 August 20; accepted 2001 October 10; published 2001 October 30. We thank A. Heger for providing his calculations of the metal yields from very massive stars. Support for this work was provided by NSF grant AST 00-96023 (S. P. O.), by NASA through ATP grant NAG5-4236 (P. M.), and by NASA NAG5-10293 and Caltech Division Contribution 8771(1082) (K. M. N. and G. J. W.).
Funding AgencyGrant Number
NSFAST 00-9602
Subject Keywords:cosmology: theory—early universe—galaxies: formation—stars: abundances
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences8771
Lunatic Asylum Lab1082
Issue or Number:1
Record Number:CaltechAUTHORS:20131119-110621703
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Official Citation:Did Very Massive Stars Preenrich and Reionize the Universe? S. Peng Oh et al. 2001 ApJ 562 L1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42567
Deposited By: Tony Diaz
Deposited On:19 Nov 2013 19:47
Last Modified:10 Nov 2021 16:25

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