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The Small-Scale Structure of the Magellanic Stream


Stanimirovic, S and Dickey, JM and Krco, M and Brooks, AM, The Small-Scale Structure of the Magellanic Stream, The Astrophysical Journal, 576, (2) pp. 773-789. ISSN 0004-637X (2002) [Refereed Article]

DOI: doi:10.1086/341892


We have mapped two regions at the northern tip of the Magellanic Stream in neutral hydrogen 21 cm emission, using the Arecibo telescope. The new data are used to study the morphology and properties of the Stream far away from the Magellanic Clouds, as well as to provide indirect constraints on the properties of the Galactic halo. We investigate confinement mechanisms for the Stream clouds and conclude that these clouds cannot be gravitationally confined or in free expansion. The most likely mechanism for cloud confinement is pressure support from the hot Galactic halo gas. This allows us to place an upper limit on the halo density: nh (15 kpc) = 10-3 cm-3 and/or nh (45 kpc) = 3 × 10-4 cm-3, depending on the distance. These values are significantly higher than predicted for an isothermal stratified halo.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:46594
Year Published:2002
Web of Science® Times Cited:60
Deposited By:Physics
Deposited On:2007-08-28
Last Modified:2011-08-02

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