Lyman-alpha radiative transfer: Modeling spectrum and surface brightness profile of Lyman-alpha emitting galaxies at z=3-6. (arXiv:2007.08172v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Song_H/0/1/0/all/0/1">Hyunmi Song</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Seon_K/0/1/0/all/0/1">Kwang-Il Seon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hwang_H/0/1/0/all/0/1">Ho Seong Hwang</a>
We perform Lyman-alpha radiative transfer calculations for reproducing
Lyman-alpha properties of star-forming galaxies at high redshifts. We model a
galaxy as a halo in which the density distributions of Lyman-alpha sources and
H I plus dust medium are described with exponential functions. We also consider
an outflow of the medium that represents a momentum-driven wind in a
gravitational potential well. We successfully reproduce both the spectra and
the surface brightness profiles of eight star-forming galaxies at z =3-6
observed with MUSE using this outflowing halo model with Lyman-alpha
scattering. The best-fit model parameters (i.e., the outflowing velocity and
optical depth) for these galaxies are consistent with other studies. We examine
the impacts of individual model parameters and input spectrum on emerging
spectrum and surface brightness profile. Further investigations on correlations
among observables (i.e., the spatial extent of Lyman-alpha halos and
Lyman-alpha spectral features) and model parameters, and spatially resolved
spectra are presented as well. We demonstrate that the combination of spectrum
and surface brightness profile provides strong constraints on model parameters
and thus spatial/kinematic distributions of medium.
We perform Lyman-alpha radiative transfer calculations for reproducing
Lyman-alpha properties of star-forming galaxies at high redshifts. We model a
galaxy as a halo in which the density distributions of Lyman-alpha sources and
H I plus dust medium are described with exponential functions. We also consider
an outflow of the medium that represents a momentum-driven wind in a
gravitational potential well. We successfully reproduce both the spectra and
the surface brightness profiles of eight star-forming galaxies at z =3-6
observed with MUSE using this outflowing halo model with Lyman-alpha
scattering. The best-fit model parameters (i.e., the outflowing velocity and
optical depth) for these galaxies are consistent with other studies. We examine
the impacts of individual model parameters and input spectrum on emerging
spectrum and surface brightness profile. Further investigations on correlations
among observables (i.e., the spatial extent of Lyman-alpha halos and
Lyman-alpha spectral features) and model parameters, and spatially resolved
spectra are presented as well. We demonstrate that the combination of spectrum
and surface brightness profile provides strong constraints on model parameters
and thus spatial/kinematic distributions of medium.
http://arxiv.org/icons/sfx.gif
