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Using four different suites of cosmological simulations, we generatesynthetic spectra for galaxies with different Lyman continuum escape fractions(fesc) at redshifts z=7-9, in the rest-frame wavelength range relevant for theJames Webb Space Telescope (JWST) NIRSpec instrument. By investigating theeffects of realistic star formation histories and metallicity distributions onthe EW(Hb)-beta diagram (previously proposed as a tool for identifying galaxieswith very high fesc), we find that neither of these effects are likely tojeopardize the identification of galaxies with extreme Lyman continuum leakage.Based on our models, we expect essentially all z=7-9 galaxies that exhibitrest-frame EW(Hb)< 30 {\AA} to have fesc>0.5. Incorrect assumptions concerningthe ionizing fluxes of stellar populations or the dust properties of z>6galaxies can in principle bias the selection, but substantial modeldeficiencies of this type will at the same time reveal themselves as an offsetbetween the observed and simulated distribution of z>6 galaxies in theEW(Hb)-beta diagram. Such offsets would thereby allow JWST/NIRSpec measurementsof these observables to serve as input for further model refinement.

astrophysical journal/the astrophysical journal

The spectral evolution of the first Galaxies. III. Simulated James Webb  Space Telescope spectra of reionization-epoch galaxies with Lyman continuum  leakage