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GSH 006-15+7: A local Galactic supershell featuring transition from HI emission to absorption

We report on the discovery of a new Galactic supershell, GSH 006-15+7, from the Galactic All Sky Survey data. Observed and derived properties are presented and we find that GSH 006-15+7 is one of the nearest physically large supershells known, with dimensions of ~ 780 x 520 pc at a distance of ~ 1.5 kpc. The shell wall appears in HI emission at b <~ -6.5 deg and in HI self-absorption (HISA) at b >~ -6.5 deg. We use this feature along with HISA diagnostics to estimate an optical depth of tau ~ 3, a spin temperature of ~ 40 K and a swept-up mass of M ~ 3e6 solar masses. We also investigate the origin of GSH 006-15+7, assessing the energy contribution of candidate powering sources and finding evidence in favour of a formation energy of ~ 1e52 ergs. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disk into the halo.

preprint2012arXivOpen access
Vanessa A. MossNaomi M. McClure-GriffithsRobert BraunAlex S. HillGreg J. Madsen
astro-ph.GA
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Vanessa A. MossNaomi M. McClure-GriffithsRobert BraunAlex S. HillGreg J. Madsen

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