Velocities of Warm Galactic Outflows from Synthetic Halpha Observations
of Star-forming Galaxies
(2015)cite arxiv:1511.07653v1Comment: 14 pages, 13 figures, submitted to MNRAS.Abstract
The velocity structure imprinted in the Halpha emission line profiles
contains valuable information about galactic outflows. Using a set of
high-resolution zoom-in cosmological simulations of galaxies at z=2, we
generate Halpha emission line profiles, taking into account the
temperature-dependent Halpha emissivity, as well as dust extinction. The lines
can be described as a sum of two gaussians, as typically done with
observations. In general, its properties are in good agreement with those
observed in local isolated galaxies with similar masses and star formation
rates. Blueshifted outflows are very common in the sample. They extend several
kpc above the galaxy discs. They are also spread over the full extent of the
discs. However, at small radii, the material with high velocities tends to
remain confined within a thick disc, as part of galactic fountains or a
turbulent medium, most probably due to the deeper gravitational potential at
the galaxy center.
Description
[1511.07653v1] Velocities of Warm Galactic Outflows from Synthetic Halpha Observations of Star-forming Galaxies