Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey
M. Gronke. (2017)cite arxiv:1709.07008Comment: 10 pages, 7 figures; data can be downloaded at http://bit.ly/a-spectra-of-MW.
Аннотация
We compare $237$ Lyman-$\alpha$ (Ly$\alpha$) 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 $94\%$ of the fits possess a
goodness-of-fit value of $p(\chi^2)>0.1$. 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$\alpha$ spectral shapes require an outflow and only $5\%$ are
well-fitted through an inflowing shell. In addition, we find $46\%$ of the
spectra to be consistent with a neutral hydrogen column density
$<10^17\,cm^-2$ - suggestive of a non-negligible fraction of
continuum leakers in the MUSE-Wide sample. Furthermore, we correlate the
spectral against the Ly$\alpha$ halo properties against each other but do not
find any strong correlation.
Описание
[1709.07008] Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey
%0 Generic
%1 gronke2017modeling
%A Gronke, Max
%D 2017
%K lya model muse spectra
%T Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey
%U http://arxiv.org/abs/1709.07008
%X We compare $237$ Lyman-$\alpha$ (Ly$\alpha$) 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 $94\%$ of the fits possess a
goodness-of-fit value of $p(\chi^2)>0.1$. 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$\alpha$ spectral shapes require an outflow and only $5\%$ are
well-fitted through an inflowing shell. In addition, we find $46\%$ of the
spectra to be consistent with a neutral hydrogen column density
$<10^17\,cm^-2$ - suggestive of a non-negligible fraction of
continuum leakers in the MUSE-Wide sample. Furthermore, we correlate the
spectral against the Ly$\alpha$ halo properties against each other but do not
find any strong correlation.
@misc{gronke2017modeling,
abstract = {We compare $237$ Lyman-$\alpha$ (Ly$\alpha$) 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 $p(\chi^2)>0.1$. 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$\alpha$ 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
$<10^{17}\,\mathrm{cm}^{-2}$ - suggestive of a non-negligible fraction of
continuum leakers in the MUSE-Wide sample. Furthermore, we correlate the
spectral against the Ly$\alpha$ halo properties against each other but do not
find any strong correlation.},
added-at = {2017-09-22T14:30:52.000+0200},
author = {Gronke, Max},
biburl = {https://www.bibsonomy.org/bibtex/2ae4421bf40897d220efdded055aadd73/miki},
description = {[1709.07008] Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey},
interhash = {13ae1758dcad9edfacaf1fa26a03c298},
intrahash = {ae4421bf40897d220efdded055aadd73},
keywords = {lya model muse spectra},
note = {cite arxiv:1709.07008Comment: 10 pages, 7 figures; data can be downloaded at http://bit.ly/a-spectra-of-MW},
timestamp = {2017-09-22T14:30:52.000+0200},
title = {Modeling $237$ Lyman-$\alpha$ spectra of the MUSE-Wide survey},
url = {http://arxiv.org/abs/1709.07008},
year = 2017
}