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arXiv:astro-ph/0010140 (astro-ph)
[Submitted on 6 Oct 2000]

Title:Automatic Shell Detection in CGPS Data

Authors:Sergey Mashchenko, Nicole St-Louis
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Abstract: A numerical code aiming at the automatic detection of spherical expanding HI shells in radio data-cubes is presented. The following five shell parameters are allowed to vary within a specified range: angular radius, expansion velocity and three center coordinates (galactic coordinates l and b, and systemic radial velocity V). We discuss several factors which can reduce the sensitivity of the shell detection: the presence of noise (both instrumental and "structural"), the fragmentation and asphericity of the shell and the inhomogeneity of the background and/or foreground emission. The code is tested on four objects: two HII regions and two early B stars. We use HI data from the Canadian Galactic Plane Survey. In all four cases the evidence for an expanding HI shell is found.
Comments: 6 pages, 4 figures; to appear in the proceedings of the conference "Interacting Winds from Massive Stars" (ASP Conference Series), eds. A. F. J. Moffat, and N. St-Louis
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0010140
  (or arXiv:astro-ph/0010140v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0010140

Submission history

From: Sergey Mashchenko [view email]
[v1] Fri, 6 Oct 2000 20:42:02 UTC (585 KB)
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