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

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Abstract

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 × 520pc at a distance of ∼ 1.5kpc. The shell wall appears in Hi emission at b≲-65 and in Hi self-absorption (HiSA) at b≳-65. We use this feature along with HiSA diagnostics to estimate an optical depth of τ∼ 3, a spin temperature of ∼40K and a swept-up mass of M∼ 3 × 10 6M ⊙. 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 ∼10 52 erg. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disc into the halo. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

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Moss, V. A., Mcclure-Griffiths, N. M., Braun, R., Hill, A. S., & Madsen, G. J. (2012). GSH 006-15+7: A local Galactic supershell featuring transition from Hi emission to absorption. Monthly Notices of the Royal Astronomical Society, 421(4), 3159–3169. https://doi.org/10.1111/j.1365-2966.2012.20538.x

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