The Evolution of Dust in Cassiopeia A

Details The Evolution of Dust in Cassiopeia A The Evolution of Dust in Cassiopeia A

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3310r&link_type=abstract

Spitzer Proposal ID #3310

Computer Science

Scientific paper

The supernova remnant Cas A is forming and destroying dust as it rapidly evolves on both large and small scales. The forward shock is sweeping up a clumpy CSM and its reverse shock is being overtaken by freely expanding ejecta, which are then shocked, heated and decelerated. These processes lead to multiple interacting 10^4K, 10^7K and relativistic plasmas which provide both the material and the environment in which the dust evolves. Multiple-epoch Chandra, HST and the VLA data, up to 2003-4, map out the current state and kinematics of these plasmas. With individual features brightening and fading over 30-50 years, we will sample structures in all possible dynamical states, allowing us to obtain a snapshot history of dust evolution. The addition of IRAC high resolution maps at 8 microns and global IRS mapping, as proposed here, along with the existing MIPS data and our sub-mm images, will thus allow us to construct a coherent picture of the evolution of dust and gas, with its large scale variations in composition, temperature and pre-SN mixing of ejecta layers. We will also make a critical measurement of the synchrotron brightness at 3.6, 4.5 micron to probe the likely important contribution of cosmic rays to the entire dynamical evolution of the remnant. The IRAC images and IRS data cube will serve as a public archive for comparison, e.g., with the coeval 1 Msec Chandra data and for future studies. The proposal team brings together people who are both leaders in the science of SNR and dust evolution and who have technical expertise in Spitzer instrumentation, multiwavelength observations, image and spectral analysis, theoretical modeling and who have genially evolved, for many years, along with Cas A.

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