Modeling $237$ Lyman-$α$ spectra of the MUSE-Wide survey

Max Gronke

doi:10.1051/0004-6361/201731791

paper

Modeling $237$ Lyman- $α$ spectra of the MUSE-Wide survey

arXiv:1709.07008 · doi:10.1051/0004-6361/201731791

Abstract

We compare $237$ Lyman- $α$ (Ly $α$ ) spectra of the "MUSE-Wide survey" (Herenz et al. 2017) to a suite of radiative transfer simulations consisting of a central luminous source within a concentric, moving shell of neutral gas, and dust. This six parameter shell-model has been used numerously in previous studies, however, on significantly smaller data-sets. We find that the shell-model can reproduce the observed spectral shape very well - better than the also common `Gaussian-minus-Gaussian' model which we also fitted to the dataset. Specifically, we find that $\sim 94%$ of the fits possess a goodness-of-fit value of $p (χ^{2}) > 0.1$ . The large number of spectra allows us to robustly characterize the shell-model parameter range, and consequently, the spectral shapes typical for realistic spectra. We find that the vast majority of the Ly $α$ spectral shapes require an outflow and only $\sim 5%$ are well-fitted through an inflowing shell. In addition, we find $\sim 46%$ of the spectra to be consistent with a neutral hydrogen column density $< 1 0^{17} cm^{- 2}$ - suggestive of a non-negligible fraction of continuum leakers in the MUSE-Wide sample. Furthermore, we correlate the spectral against the Ly $α$ halo properties against each other but do not find any strong correlation.

arXiv comment10 pages, 7 figures; data can be downloaded at http://bit.ly/a-spectra-of-MW

Modeling $237$ Lyman- $α$ spectra of the MUSE-Wide survey

Abstract

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Modeling 237 Lyman-α spectra of the MUSE-Wide survey

Abstract

References in corpus (58)

Cited by in corpus (48)

Modeling $237$ Lyman- $α$ spectra of the MUSE-Wide survey