The Spectral Evolution of the First Galaxies. III. Simulated James Webb Space Telescope Spectra of Reionization-epoch Galaxies with Lyman-continuum Leakage

Erik Zackrisson, Christian Binggeli, Kristian Finlator, Nickolay Y. Gnedin, Jan Pieter Paardekooper, Ikkoh Shimizu, Akio K. Inoue, Hannes Jensen, Genoveva Micheva, Sadegh Khochfar, Claudio Dalla Vecchia

研究成果: Article査読

28 被引用数 (Scopus)

抄録

Using four different suites of cosmological simulations, we generate synthetic spectra for galaxies with different Lyman-continuum ESCape fractions (fESC) at redshifts z ≈ 7-9, in the rest-frame wavelength range relevant for the James Webb Space TelESCope (JWST) NIRSpec instrument. By investigating the effects of realistic star formation histories and metallicity distributions on the EW(Hβ)-β diagram (previously proposed as a tool for identifying galaxies with very high fESC), we find that neither of these effects are likely to jeopardize the identification of galaxies with extreme Lyman-continuum leakage. Based on our models, we expect that essentially all z ≈ 7-9 galaxies that exhibit rest-frame EW(Hβ) ≲ 30 Å to have fESC > 0.5.. Incorrect assumptions concerning the ionizing fluxes of stellar populations or the dust properties of z > 6 galaxies can in principle bias the selection, but substantial model deficiencies of this type should at the same time be evident from offsets in the observed distribution of z > 6 galaxies in the EW(Hβ)-β diagram compared to the simulated distribution. Such offsets would thereby allow JWST/NIRSpec measurements of these observables to serve as input for further model refinement.

本文言語English
論文番号78
ジャーナルAstrophysical Journal
836
1
DOI
出版ステータスPublished - 2017 2 10
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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