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Session 74 - Supernova Remnants.
Display session, Thursday, June 13
We present a movie of the evolving radio emission from 1978 to 1994 of the supernova remnant Cassiopeia A. The images are at a resolution of 1.3 arcseconds and an observing wavelength of 6cm, taken at the Cambridge 5km and Very Large Array radio interferometers. In the movie, one can see the overall expansion of the remnant by approximately 1.3 percent, high velocity knots and bow shocks, large filamentary and cellular structures, dark lanes moving across extended emission, and a variety of features evolving in brightness and structure. The velocity structure in the remnant is complex, and the movie allows one to disentangle overlapping features moving at different speeds and directions. Some structures, on both large and small scales, are seen moving backwards, towards the center of the remnant. We will briefly discuss possible physical interpretations of the observed features.
This work is supported, in part, by NSF grant AST93-18959 at the University of Minnesota.
Program listing for Thursday