Upper limits on the mass and luminosity of Population III-dominated galaxies

Hidenobu Yajima, Sadegh Khochfar

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We here derive upper limits on the mass and luminosity of Population III (POPIII) dominated proto-galaxies based on the collapse of primordial gas under the effect of angular momentum loss via Lya radiation drag and the gas accretion on to a galactic centre. Our model predicts that POPIII-dominated galaxies at z ~ 7 are hosted by haloes with Mh ~ 1.5 x 108-1.1 x 109M M⊙ that they have Lya luminosities of LLya ~ 3.0 x 1042-2.1 x 1043 ergs-1, stellar mass of Mstar ~ 0.8 x 105-2.5 x 106 M⊙ and outflowing gas with velocities Vout ~ 40 km s-1 due to Lya radiation pressure. We show that the POPIII galaxy candidate CR7 violates the derived limits on stellar mass and Lyα luminosity and thus is unlikely to be a POPIII galaxy. POPIII-dominated galaxies at z ~ 7haveHen line emission that is ~ 1-3 orders of magnitude lower than that of Lya, theyhavehighLya equivalent width of ~300 A and should be found close to bright star-forming galaxies. The Hen 1640 A line is in comfortable reach of next generation telescopes, like the James Webb Space Telescope (JWST) or Thirty Meter Telescope (TMT).

Original languageEnglish
Pages (from-to)L51-L55
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume467
Issue number1
DOIs
Publication statusPublished - 2017 May 1

Keywords

  • Galaxies: Evolution
  • Galaxies: Formation
  • Galaxies: High-redshift
  • Radiative transfer
  • Stars: Population III

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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