Ejecta Knot Evolution in Cassiopeia A

Details Ejecta Knot Evolution in Cassiopeia A Ejecta Knot Evolution in Cassiopeia A

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21821907r&link_type=abstract

American Astronomical Society, AAS Meeting #218, #219.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigated the spectral evolution of the bright ejecta knots in Cassiopeia A to better understand how these coherent masses interact with shocks and physically change.
With over a decade of outstanding Chandra observations, we were able to utilize widely spaced epochs to look for evolution of the supernova remnant in the X-ray band. We present our findings of how such modeled plasma parameters as the temperature and non-equilibrium ionization age changed over ten years of the several hundred year old remnant's lifetime, as well as how these parameters correlate with the estimated time since shocked. Careful analyses of background contamination and model parameter correlations were also considered.
High resolution dispersed data were taken to complement the ACIS observations, yielding a unique set of low density plasma measurements. We find disagreements between the temperatures derived by the non-equilibrium ionization model using the ACIS data and newly released plasma emission models, which utilize the Si triplet ratios from the dispersed data.

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