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A. Asgekar, J. English, S. Safi-Harb (University of Manitoba, Winnipeg, Canada)
Worms are dusty, neutral Hydrogen (HI) structures observed to rise perpendicular to the Galactic plane. Observations made with the synthesis telescope of the Dominion Radio Astrophysical Observatory revealed that a previously catalogued worm, GW123.4-1.5, has a mushroom-shaped morphology. The Canadian Galactic Plane Survey data, collected with the same telescope, have been systematically searched for similar worms and we will present a catalog of observed structures. For confirmed worms, we are analyzing HI emission for correlations between morphology and the kinematics expected for old supernova remnants (SNRs). This may establish a possible evolutionary sequence between SNRs and mushroom-shaped clouds, as was suggested by one of the plausible numerical models for GW123.4-1.5. We discuss, in detail, some interesting candidates and the implications of our results.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.