High Velocity Gas in the Halos of Spiral Galaxies

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dc.creatorFraternali, Filippo
dc.creatorOosterloo, Tom
dc.creatorBoomsma, Rense
dc.creatorSwaters, Rob
dc.creatorSancisi, Renzo
dc.date2003-10-28
dc.date.accessioned2026-07-07T02:10:53Z
dc.date.available2026-07-07T02:10:53Z
dc.descriptionRecent, high sensitivity, HI observations of nearby spiral galaxies show that their thin `cold' disks are surrounded by thick layers (halos) of neutral gas with anomalous kinematics. We present results for three galaxies viewed at different inclination angles: NGC891 (edge-on), NGC2403 (i=60 deg), and NGC6946 (almost face-on). These studies show the presence of halo gas up to distances of 10-15 kpc from the plane. Such gas has a mean rotation 25-50 km/s lower than that of the gas in the plane, and some complexes are detected at very high velocities, up to 200-300 km/s. The nature and origin of this halo gas are poorly understood. It can either be the result of a galactic fountain or of accretion from the intergalactic medium. It is probably the analogous of some of the High Velocity Clouds (HVCs) of the Milky Way.
dc.description6 pages, 4 figures. To appear in the ASP proceedings of IAU Symposium 217, "Recycling intergalactic and interstellar matter", eds. Pierre-Alain Duc, Jonathan Braine, Elias Brinks
dc.identifierhttps://arxiv.org/abs/astro-ph/0310799
dc.identifierhttp://arxiv.org/abs/astro-ph/0310799
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6890
dc.subjectAstrophysics
dc.titleHigh Velocity Gas in the Halos of Spiral Galaxies
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