HVCs probing a gaseous Galactic halo

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dc.creatorKalberla, P. M. W.
dc.creatorKerp, J.
dc.creatorHaud, U.
dc.date1998-11-27
dc.date.accessioned2026-07-07T02:29:19Z
dc.date.available2026-07-07T02:29:19Z
dc.descriptionWe study the hypothesis that high-velocity clouds (HVCs) may originate from instabilities within the gaseous phase of the Galactic halo. According to the hydrostatic equilibrium model of Kalberla & Kerp (1998), we determine the probability distribution of occurrence of instabilities within the Galactic halo. Instabilities may produce condensations within the Galactic halo beyond a z-distances of 4 kpc, which are accelerated by gravity and decelerated by drag-forces. We present evidence that the HI high-velocity dispersion component, discovered by Kalberla et al. (1998) is associated with high-velocity-halo gas. The physical properties of this high-velocity-halo gas are similar to the recently detected highly-ionized HVCs by Sembach et al. (1995, 1998). Accordingly, the HI high-velocity dispersion component may be the neutral tracer of the turbulent gas motions within the Galactic halo. Our calculations demonstrate, that the sky-averaged signal of in-falling condensations does not differ significantly from the HI emission of the turbulent Galactic halo gas.
dc.description10 pages, 4 figures, to be published in the Proceedings of the Stromlo Workshop on High-Velocity Clouds
dc.identifierhttps://arxiv.org/abs/astro-ph/9811435
dc.identifierhttp://arxiv.org/abs/astro-ph/9811435
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13429
dc.subjectAstrophysics
dc.titleHVCs probing a gaseous Galactic halo
dc.typetext

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