Possible discovery of primordial stars at z = 3

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recent discovery of galaxies emitting surprisingly strong Lyman continuum at redshift z≃3 with Subaru telescope is discussed. These galaxies are brighter at 900 Å in their rest-frame (i.e. hydrogen ionizing radiation) than at 1600 Å (non-ionizing radiation). Such an extreme spectrum, which we call Lyman limit 'bump', has been never expected by any spectral models of galaxies so far. Here, we show that the observed strength of the Lyman bump can be explained by a model spectrum of a galaxy which has matter-bounded nebulae photoionized by very massive (∼ 100 M⊙) and metal-free (so-called Population III) stars. This suggests that such a primordial stellar population still exists at z ≃ 3, rather late epoch of the cosmic evolution.

Original languageEnglish
Title of host publicationTours Symposium on Nuclear Physics and Astrophysics - VII
Pages130-132
Number of pages3
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event7th Tours Symposium on Nuclear Physics and Astrophysics - Kobe, Japan
Duration: 2009 Nov 162009 Nov 20

Publication series

NameAIP Conference Proceedings
Volume1238
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th Tours Symposium on Nuclear Physics and Astrophysics
CountryJapan
CityKobe
Period09/11/1609/11/20

Keywords

  • Cosmology
  • First star
  • Reionization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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