Where are the high velocity clouds?

Details Where are the high velocity clouds? Where are the high velocity clouds?

2001-06-14

arxiv.org/abs/astro-ph/0106253v2

ApJLetters, 2001, 555, L95-L98

Astronomy and Astrophysics

Astrophysics

4 Latex pages with emulateapj.sty, 3 postscript figures. Accepted in ApJLetters. One extra reference added

Scientific paper

10.1086/322866

Recent observations of high velocity clouds (HVCs) have revealed compression fronts and tail shaped features of HI suggesting that they are interacting with external medium. We perform 3-D hydro-dynamical simulations of HVCs moving through a diffuse hot gaseous component, investigating the behaviour of both extra-galactic dark matter dominated HVCs and nearby pure gas clouds that may be accreting onto the Galactic disk via a Galactic fountain. Both scenarios can give rise to similar features as observed if the external medium has a density $>10^{-4}$ cm$^{-3}$. Observations suggest that this may be too high for a hot ionised halo or intergalactic gas and supports the Galactic fountain origin, a model that can also account for the high fraction of HVCs with tails and asymmetrical morphologies.

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