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Loops, Drips, and Walls in the Galactic Chimney GSH 277+00+36


McClure-Griffiths, NM and Dickey, JM and Gaensler, BM and Green, AJ, Loops, Drips, and Walls in the Galactic Chimney GSH 277+00+36, The Astrophysical Journal, 594, (2) pp. 833-843. ISSN 0004-637X (2003) [Refereed Article]

DOI: doi:10.1086/377152


We present new high-resolution H I images of the Galactic chimney GSH 277+00+36. The chimney is at a distance of ∼6.5 kpc, is more than 600 pc in diameter, and extends at least 1 kpc above and below the Galactic midplane. Using the Australia Telescope Compact Array and the Parkes Radiotelescope as part of the Southern Galactic Plane Survey, we have imaged the H I associated with this chimney, with a spatial resolution of ∼6 pc. These are among the highest spatial resolution images of an H I chimney. We find very narrow well-defined shell walls, a remarkably empty interior, and complex small-scale structures. The shell walls show a very steep reduction in emission at the interior edge and a more gradual decline toward the exterior. We suggest that this structure is characteristic of compression and may be used to distinguish stellar by-product shells from shell-like structures resulting from random turbulent motions. The shell and chimney walls also exhibit a great deal of small-scale structure, which we discuss in the context of hydrodynamic instabilities. We find that these structures are primarily cold gas with narrow line widths in the range 1.5-2.5 km s-1.

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:46595
Year Published:2003
Web of Science® Times Cited:36
Deposited By:Physics
Deposited On:2007-08-28
Last Modified:2011-11-29

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