AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 85. Supernova Remnants and Planetary Nebulae
Display, Thursday, June 3, 1999, 9:20am-4:00pm, Southwest Exhibit Hall

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[85.12] The deepest X-ray images of supernova remnant Cassopeia-A

V. Yuille, R. Mukherjee (Barnard College), E. V. Gotthelf (Columbia University)

We present the deepest X-ray images of the line and continuum emissions for the supernova remnant Cas-A obtained to-date. Over 714 kilosecs of X-ray data have been collected for the purpose of spectral calibration of the Solid State Imaging Spectrometers (SIS) on-board the Advanced Satellite for Cosmology and Astrophysics (ASCA). By co-adding data from the 47 observations which comprise these observations we are able to map the X-ray emission in the Si, S, Ar, Ca, and Fe K{\alpha} lines, as well as the continuum, with unprecedented statistics. We present the first images of the Fe K{\alpha} line with sufficient photons to address the question of the spatial segregation of the higher atomic number elements. Furthermore, we consider the evidence for a non-thermal mechanism for the continuum emission.

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