The HI environment of three superbubbles in Large Magellanic Cloud
M.S. Oey, B. Groves, L. Staveley-Smith, & R.C. Smith
DEM L50 in H-alpha (image) and HI (contours).
The ambient interstellar environment of wind- and supernova-driven
superbubbles strongly affects their evolution, but its properties are
rarely well-determined. We have therefore obtained HI aperture synthesis
imaging of the environment around three similar, optically-selected
superbubble nebulae in the Large Magellanic Cloud. The resulting HI maps
show that the ambient gas distribution around these superbubbles
differ to an extreme: DEM L25 shows no neutral shell component, but
is nestled within an HI hole; DEM L50 shows a massive neutral shell
component, but is otherwise within an HI void; and DEM L301 shows no
correspondence at all between the optical nebula and HI distribution.
There is also poor correspondence between the HI and optical kinematics.
These results strongly caution against inferring properties of the
ambient environment of individual superbubbles without direct
observations. Finally, all three objects show some evidence of shock
2002 AJ, 123, 255
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