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The HI Halo of Spiral Galaxies

descriptionPublicationkeyboard_double_arrow_right Part of book or chapter of book , Article , Preprint , Conference object 01 Jan 2004Embargo end date: 01 Jan 2000 Italy, Netherlands English Publisher:Springer NetherlandsJournal:Astrophysics and Space Science, volume 289, pages 377-380 (issn: 0004-640X, eissn: 1572-946X,

Authors: Gustaaf van Moorsel; Filippo Fraternali; Renzo Sancisi; Tom Oosterloo;

doi: 10.1007/978-94-007-0979-9_29 , 10.1023/b:astr.0000014967.10190.cd , 10.48550/arxiv.astro-ph/0009119

arXiv: http://arxiv.org/abs/astro-ph/0009119

handle: 11370/ead03454-4e82-4cf2-93ca-1c7917960db8 , 11585/40441

The HI Halo of Spiral Galaxies

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Abstract

The results of observational studies on the vertical HI density distribution and kinematics of the disks of spiral galaxies are reported and discussed. Attention is drawn to the presence of HI emission, unknown before and here referred to as the `beard', which has anomalous structure and kinematics, different from the known cold HI disk. This component is extended and probably located in the halo region, it is rotating more slowly than the disk and shows radial inward motion. Its nature and origin -galactic fountain or infall of primordial gas?- are still a puzzle.

8 pages, 4 ps figures; to appear in "Gas & Galaxy Evolution", VLA 20th Anniversary Conference, J.E. Hibbard, M.P. Rupen & J.H. van Gorkom (eds.)

Countries

Italy, Netherlands

Related Organizations

University of Groningen
Netherlands
National Institute for Astrophysics
Italy
Alma Mater Studiorum University of Bologna
Italy
Osservatorio di Astrofisica e Scienza dello Spazio
Italy
Kapteyn Astronomical Institute
Netherlands

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Keywords

galaxies : individuals (NGC 2403, CHANDRA, NGC 891), Astrophysics (astro-ph), FOS: Physical sciences, HIGH-VELOCITY CLOUDS, NGC-2403, Astrophysics, galaxies : structure and dynamics, galaxies : halo, galaxies : ISM

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