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Title:
The Small-Scale Structure of the Magellanic Stream
Authors:
Stanimirović, Snežana; Dickey, John M.; Krčo, Marko; Brooks, Alyson M.
Affiliation:
AA(Arecibo Observatory, NAIC/Cornell University, HC 3 Box 53995, Arecibo, PR 00612; ), AB(Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455), AC(Department of Physics and Astronomy, Colgate University, 13 Oak Drive, Hamilton, NY 13346), AD(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027)
Publication:
The Astrophysical Journal, Volume 576, Issue 2, pp. 773-789. (ApJ Homepage)
Publication Date:
09/2002
Origin:
UCP
ApJ Keywords:
Galaxies: Halos, Galaxies: Interactions, Galaxies: Magellanic Clouds, Radio Lines: Galaxies
DOI:
10.1086/341892
Bibliographic Code:
2002ApJ...576..773S

Abstract

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(15kpc)=10-3 cm-3 and/or nh(45kpc)=3×10-4 cm-3, depending on the distance. These values are significantly higher than predicted for an isothermal stratified halo.
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