The HI shell G132.6-0.7-25.3: A Supernova Remnant or an Old Wind-Blown Bubble?

Abstract

Data from the Canadian Galactic Plane Survey reveal an abundance of HI shells and arcs in the disk of our galaxy. While their shape is suggestive of stellar winds or supernovae influence, very few of these structures have been examined in detail thus far. A fine example is an HI shell in the outer Galaxy with no continuum counterpart discovered in the survey's pilot project. Its size and kinematics suggest that it was created by the winds of a single late-type O star which has since evolved off the main sequence or by a supernova explosion. A B1 Ia star at the centre of the shell, in projection, is a possible candidate for energy source if the shell is assumed to be wind-blown. The shell's shape implies a surprisingly small scale height of less than about 30 pc for the surrounding gas if the elongation is due to evolution in a density gradient.

25 pages, 6 figures. Accepted for publication in the Astronomical Journal

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• Dynamical Evolution and Ionization Structure of an Expanding Superbubble: Application to W4
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• A Search for Narrow Vertical Structures in the Canadian Galactic Plane Survey
• GSH 91.5+2-114: A large HI shell in the outer part of the Galaxy
• Studying the interstellar medium to look for relics of triggered star formation among stellar clusters