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28 March 2024
 
  » arxiv » astro-ph/0510304

 Article overview


Evidence for chimney breakout in the Galactic supershell GSH 242-03+37
N. M. McClure-Griffiths ; A. Ford ; D. J. Pisano ; B. K. Gibson ; L. Staveley-Smith ; M. R. Calabretta ; L. Dedes ; & P. M. W. Kalberla ;
Date 11 Oct 2005
AbstractWe 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.
Source arXiv, astro-ph/0510304
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