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

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

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...594..833m&link_type=abstract

The Astrophysical Journal, Volume 594, Issue 2, pp. 833-843.

Astronomy and Astrophysics

Astronomy

18

Galaxy: Kinematics And Dynamics, Galaxy: Structure, Ism: Bubbles, Ism: Structure, Radio Lines: Ism

Scientific paper

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.

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