Evidence for chimney breakout in the Galactic supershell GSH 242-03+37

Details Evidence for chimney breakout in the Galactic supershell GSH 242-03+37 Evidence for chimney breakout in the Galactic supershell GSH 242-03+37

2005-10-11

arxiv.org/abs/astro-ph/0510304v1

Astrophys.J.638:196-205,2006

Astronomy and Astrophysics

Astrophysics

27 pages, 6 figures. To appear in ApJ. Version with full resolution figures available at http://www.atnf.csiro.au/people/nmc

Scientific paper

10.1086/498706

We present new high resolution neutral hydrogen (H I) images of the Galactic supershell GSH 242-03+37. These data were obtained with the Parkes Radiotelescope as part of the Galactic All-Sky Survey (GASS). GSH 242-03+37 is one of the largest and most energetic H I supershells in the Galaxy with a radius of $565 \pm 65$ pc and an expansion energy of 3x10^{53} ergs. Our images reveal a complicated shell with multiple chimney structures on both sides of the Galactic plane. These chimneys appear capped by narrow filaments about 1.6 kpc above and below the Galactic mid-plane, confirming structures predicted in simulations of expanding supershells. The structure of GSH 242-03+37 is extremely similar to the only other Galactic supershell known to have blown out of both sides of the plane, GSH 277+00+36. We compare the GASS H I data with X-ray and H-alpha, finding no strong correlations.

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