The Hubble Space Telescope colours of high-redshift Population III galaxies with strong Lyα emission

Erik Zackrisson*, Akio K. Inoue, Claes Erik Rydberg, Florent Duval

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Population III (pop III) galaxies, made partly or exclusively of metal-free stars, are predicted to exist at high redshifts and may produce very strong Lyα emission. A substantial fraction of these Lyα photons are likely absorbed in the intergalactic medium at z > 6, but recent simulations suggest that significant Lyα emission may be detectable up to z≈ 8.5, i.e. well into the reionization epoch. Here, we argue that high-redshift pop III galaxies with strong Lyα emission can be identified in Hubble Space Telescope imaging data because of their unusual colours. We quantify this effect in some of the filters used in Y-band dropout searches for galaxies at z≈ 8 and find that pop III galaxies with high Lyα fluxes may exhibit much bluer J-H colours at z≈ 8-10 than any normal type of galaxy at these redshifts. This colour signature can arise even if pop III stars account for as little as ~10-3 to 10-2 of the stellar mass in these galaxies. Some of the anomalously blue objects reported in current Y-band dropout samples do in fact meet the colour criteria for Lyα-emitting pop III galaxies.

本文言語English
ページ(範囲)L104-L108
ジャーナルMonthly Notices of the Royal Astronomical Society: Letters
418
1
DOI
出版ステータスPublished - 2011 11
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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