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The impact of nebular Lyman-Continuum on ionising photons budget and escape fractions from galaxies by Simmonds, C.; Verhamme, A.; Inoue, A. K.; Katz, H.; Garel, T.; De Barros, S. is a scholarly article available to read on EtoBox.

What is The impact of nebular Lyman-Continuum on ionising photons budget and escape fractions from galaxies about?

Several Lyman Continuum (LyC) emitters have been detected so far, but their observed ionising spectra sometimes differ from attenuated stellar spectra predicted by stellar population synthesis modelling. This discrepancy may be due to a significant contribution of LyC nebular emission. We aim to quantify the importance this emission in LyC leakers: its contribution to the ionising photons budget, and to measurements of LyC escape. To estimate the nebular contribution to the LyC spectra of galaxies, we run photoionisation models with Cloudy for a range of BPASS templates, varying the column density of the surrounding gas, from density-bounded (log(NH$_{\rm{stop}}$/cm$^{-2}$)=16) to ionisation-bounded (log(NH$_{\rm{stop}}$/cm$^{-2}$)=19) regimes. In the limits of very optically thin (f$_{\rm{esc}}$ = 1), or thick configurations (f$_{\rm{esc}}$ = 0), there is no nebular contribution to the emergent LyC spectra. This contribution matters only at intermediate LyC opacities ($0 <$ f$_{\rm{esc}}$ $< 1$), where it alters the shape of the LyC spectrum chromatically, so that escape fractions estimates are highly sensitive to the wavelength range over which they are calculated. We propose a f

Author

Simmonds, C.; Verhamme, A.; Inoue, A. K.; Katz, H.; Garel, T.; De Barros, S.

Published

2024

Language

EN