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The Spectral Evolution of the First Galaxies. III. Simulated James Webb Space Telescope Spectra of Reionization-epoch Galaxies with Lyman-continuum Leakage
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
New Mexico State Univ, MSC 4500, Las Cruces, NM 88003 USA..
Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA.;Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA.;Univ Chicago, Kavli Inst Cosmol Phys & Enrico Fermi Inst, Chicago, IL 60637 USA..
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2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 836, no 1, article id 78Article in journal (Refereed) Published
Abstract [en]

Using four different suites of cosmological simulations, we generate synthetic spectra for galaxies with different Lyman-continuum escape fractions (f(esc)) at redshifts z approximate to 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(H beta)-beta diagram (previously proposed as a tool for identifying galaxies with very high f(esc)), 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 approximate to 7-9 galaxies that exhibit rest-frame EW(Hb). 30 angstrom to have f(esc) > 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(H beta)-beta 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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. 836, no 1, article id 78
Keywords [en]
dark ages, reionization, first stars, galaxies: high-redshift, techniques: spectroscopic
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-320466DOI: 10.3847/1538-4357/836/1/78ISI: 000397304500030OAI: oai:DiVA.org:uu-320466DiVA, id: diva2:1091358
Available from: 2017-04-26 Created: 2017-04-26 Last updated: 2017-04-26Bibliographically approved

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Zackrisson, ErikBinggeli, ChristianJensen, Hannes

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