A possible signature of primordial stellar populations in z = 3 Lyman α emitters

Akio K. Inoue*

*この研究の対応する著者

研究成果: Conference contribution

抄録

Observations with Subaru telescope have detected surprisingly strong Lyman continuum (LyC; ∼ 900 Å in the rest-frame) from some Lyman α emitters (LAEs) at z = 3.1. We have examined the stellar population which simultaneously accounts for the strength of the LyC and the spectral slope of non-ionizing ultraviolet of the LAEs. As a result, we have found that stellar populations with metallicity Z ≥ 1/50 Z can explain the observed LyC strength only with a very top-heavy initial mass function (IMF; 〈m〉 ∼ 50M). However, the critical metallicity for such an IMF is expected to be much lower. A very young (∼ 1 Myr) and massive (∼ 100 M) extremely metal-poor (Z≤5× 10-4Z) or metal-free (so-called Population III) stellar population can also reproduce the observed LyC strength if the mass fraction of such 'primordial' stellar population is ∼ 1% in total stellar mass of the LAEs.

本文言語English
ホスト出版物のタイトルFirst Stars IV - From Hayashi to the Future -
ページ139-142
ページ数4
DOI
出版ステータスPublished - 2012
外部発表はい
イベント1st Stars IV: From Hayashi to the Future - Kyoto, Japan
継続期間: 2012 5 212012 5 25

出版物シリーズ

名前AIP Conference Proceedings
1480
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Conference

Conference1st Stars IV: From Hayashi to the Future
国/地域Japan
CityKyoto
Period12/5/2112/5/25

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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