1. At which neutral fraction is the gas considered fully ionized in Seren?
2. The luminosity is given in Ly-alpha photons. Are these used to ionize the hydrogen and not the 13.6eV photons? Or is it assumed that 1e49 Ly-alpha photons = 1e49 13.6 eV photons? Or is the luminosity at 13.6 eV interpolated by using a black body spectrum?
To 1.) What do you mean by neutral fraction?
AntwortenLöschenTo 2.) The given number (1d49 1/s) is the rate at which the ionising source emits Lyman continuum photons. So this is the total number of photons available for ionisation.
Ok, I just read your question from a few days ago. A SPH particle is fully ionised if its ionisation fraction is 1. We do not properly treat the photo-dissociation region, so most of the particles have either ionisation fraction 1 or 0. Hope that helps!
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