Neutral hydrogen in galactic fountains

Details Neutral hydrogen in galactic fountains Neutral hydrogen in galactic fountains

2007-08-02

arxiv.org/abs/0708.0221v1

2007, MNRAS 381, L89

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures. Accepted for publication in MNRAS letters

Scientific paper

10.1111/j.1745-3933.2007.00374.x

Simulations of an isolated Milky Way-like galaxy, in which supernovae power a galactic fountain, reproduce the observed velocity and 21cm brightness statistics of galactic neutral hydrogen (HI). The simulated galaxy consists of a thin HI disk, similar in extent and brightness to that observed in the Milky Way, and extra-planar neutral gas at a range of velocities due to the galactic fountain. Mock observations of the neutral gas resemble the HI flux measurements from the Leiden-Argentine-Bonn (LAB) HI, survey, including a high-velocity tail which matches well with observations of high-velocity clouds. The simulated high-velocity clouds are typically found close to the galactic disk, with a typical line-of-sight distance of 13kpc from observers on the solar circle. The fountain efficiently cycles matter from the centre of the galaxy to its outskirts at a rate of around 0.5 M_sun/yr

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