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HI Shells Behind the Coalsack
journal contribution
posted on 2023-05-16, 19:45 authored by McClure-Griffiths, NM, John DickeyJohn Dickey, Gaensler, BM, Green, AJWe report the discovery of two new large H I shells in the direction of the Coalsack Nebula. Both shells were observed with the Parkes Radio Telescope as part of the Southern Galactic Plane Survey. The largest shell, GSH 304-00-12, is at a distance of ̃ 1.2 kpc and has derived physical dimensions of 280 x 200 pc. The second shell, GSH 305+01-24, is at a distance of ̃2.2 kpc and has derived dimensions of 280 x 440 pc. We present a simple numerical model to show that GSH 305+01-24 most likely formed from stellar winds in the Centaurus OBI stellar association. There is associated radio, infrared, and Ha continuum emission. Both shells are situated in the Sagittarius-Carina arm, with GSH 305+01-24 more distant. The far edge of GSH 304-00-12 is at the near side of the arm and opens into the interarm region. We find no evidence of closure at the near side of the shell and therefore describe the geometry as conical. Emission from the near side of the shell may be lost in absorption by the Coalsack Nebula. © 2001. The American Astronomical Society. All rights reserved.
History
Publication title
The Astrophysical JournalVolume
562Pagination
424-432ISSN
0004-637XDepartment/School
School of Natural SciencesPublisher
University of Chicago PressPlace of publication
Chicago, USARepository Status
- Restricted