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HST WFPC2 Imaging of Shocks in Superbubbles by Chen, C. -H. Rosie; Chu, You-Hua; Gruendl, Robert A.; Points, Sean D. is a scholarly article available to read on EtoBox.

What is HST WFPC2 Imaging of Shocks in Superbubbles about?

Bright X-ray emission has been detected in superbubbles in the Large Magellanic Cloud (LMC), and it is suggested that supernova remnants (SNRs) near the inner shell walls are responsible for this X-ray emission. To identify SNR shocks in superbubble interiors, we have obtained HST WFPC2 emission-line images of the X-ray-bright superbubbles DEM L 152 and DEM L 192 and the X-ray-dim superbubble DEM L 106. We use these images to examine the shell morphology and [S II]/H-alpha ratio variations in detail. Of these three superbubbles, DEM L 152 has the highest X-ray surface brightness, the most filamentary nebular morphology, the largest expansion velocity, and the highest [S II]/H-alpha ratio. Its [S II]/H-alpha ratio increases outwards and peaks in sharp filaments along the periphery. DEM L 192 has a moderate X-ray surface brightness, a complex but not filamentary morphology, a moderate expansion velocity, and a low [S II]/H-alpha ratio. DEM L 106 is not detected in X-rays. Its shell structure is amorphous and has embedded dusty features; its expansion velocity is low. None of the three superbubbles show morphological features in the shell interior that can be identified as directly as

Author

Chen, C. -H. Rosie; Chu, You-Hua; Gruendl, Robert A.; Points, Sean D.

Published

1999

Language

EN