This repository contains the data, code, and plots used in the publication:
Gazagnes et al. (2020), A&A 639, A85 DOI: https://doi.org/10.1051/0004-6361/202038096
In this study, we investigate the physical mechanisms that enable the escape of ionizing (Lyman Continuum, LyC) and Lyman-α (Lyα) photons from star-forming galaxies, focusing on a sample of 22 galaxies, including 13 confirmed LyC emitters.
We show that low neutral hydrogen (H I) covering fractions and narrower H I velocity widths are strongly correlated with: - Higher LyC and Lyα escape fractions, - Lower Lyα peak velocity separations, - Greater Lyα equivalent widths and residual flux at the Lyα trough.
These results suggest that the porosity of the interstellar medium (ISM)—due to low-density channels—is a key factor enabling photon escape. While porosity provides a lower bound on the escape, the most extreme emitters may be density-bounded along all lines of sight.
- Data/ — Observational data
- Paper/ — Contains the article pdf
- Notebooks/ — Jupyter notebooks for making the final figures
- Images/ — Figures from the paper (see examples below)
- CodeFittingIDL/ — IDL code used to perform the non-linear least square fitting.
- Measurements/ — The csv file recording all data measurements.
This is an overview of the main figures in the paper, which are reproducible with the python notebooks. The paper provides the details and context for the interested reader.
Spectral model fitting result:
Lyα profile characteristic features:
Lyα equivalent width correlations:
H I / Lyα Velocity / Covering fraction correlations:
Escape fraction correlations:
Summary sketch
If you use this code or data, please cite:
Gazagnes et al. (2020), Astronomy & Astrophysics, 639, A85 https://doi.org/10.1051/0004-6361/202038096