Large and Small Scale Changes Seen in 8 Years of Chandra Observations of Cassiopeia A

Details Large and Small Scale Changes Seen in 8 Years of Chandra Observations of Cassiopeia A Large and Small Scale Changes Seen in 8 Years of Chandra Observations of Cassiopeia A

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.3806p&link_type=abstract

American Astronomical Society, HEAD meeting #10, #38.06

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new 50 ksec Chandra ACIS-S observation of Cas A in which we follow X-ray flux changes associated with ejecta which has recently encountered the reverse shock. This new observation has allowed us to investigate both the near-term X-ray evolution and the fine-scale structure of Cas A's supernova debris. When compared to previous Chandra observations of Cas A, thermal X-ray knots and nonthermal synchrotron filaments appear and disappear on timescales of order a few years. We will present new images and spectra which clearly show the dynamical and spectral evolution of the supernova ejecta as it interacts with the supernova remnant reverse shock.
We will also present contemporaneous HST NICMOS and WFPC2 images of the identified X-ray variable features in the high ionization NIR lines of [Si VI] and [Si X] and low ionization optical lines of [S II] and [O III]. These X-ray/optical/NIR observations have yielded a multi-wavelength study of the remnant's advancing reverse shock in an inhomogeneous multi-phase ejecta medium at resolutions down to a fraction of an arcsecond, providing a hi-resolution broad temperature study of reverse shock heated ejecta. This work has been supported by the Chandra X-ray Observatory through the Guest Observer Research Award GO8-9065A.

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