Cas A: before and after the shocks

Details Cas A: before and after the shocks Cas A: before and after the shocks

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30153r&link_type=abstract

Spitzer Proposal ID #30153

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Scientific paper

A remarkable picture of Cassiopeia A's explosion has been uncovered through multiwavelength studies over the latest 10% of its life, identifying its dual shock structure, its large scale asymmetries in ejection velocity and apparent composition, and the differential deceleration of optical, X-ray and radio emitting material in their encounters with the reverse shock. Our G01 discoveries have opened up yet another major window into the structure of the explosion, which is critical not only for the explosion physics, but also for nucleosynthetic yields, dust production, and the connection of supernovae with exotic objects such as gamma-ray bursters. This proposal seeks carefully selected IRAC, low and high resolution IRS mapping of key regions of Cas A to exploit these new findings. In particular, we will: a) determine the kinematics and physical properties of the newly found, slow-moving interior ejecta, from the central disk to where they pass through the reverse shock and slowly become ionized and heated; b) make the first measurements of dust proper motions, with implications for the survivability of dust in the harsh SNR environment; c) distinguish between intrinsic explosion asymmetries and external effects on the distribution of nucleosynthetic layers; d) explore the filamentary line network (wind?, ejecta?) outside of Cas A's forward shock; and e) provide a powerful additional probe of light echoes.

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