Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9537r&link_type=abstract
HST Proposal ID #9537
Physics
Hst Proposal Id #9537 Ism And Circumstellar
Scientific paper
We propose to use the WFPC2 archive data on supernova remnant Cas A along with new and existing Chandra and VLA data, to construct a coherent physical picture of its multiple interacting thermal and relativistic plasmas. These multiple plasmas have distinct kinematics and their relationships are poorly understood. There have been very few multiwavelength studies of any SNRs to date and none have had the high- resolution detail now available with HST and Chandra. We will first examine the behavior of shocks in an inhomogeneous environment with a comparison of clump structures in the optical, X-ray, and radio images. Our second goal is to study the amplification and ordering of magnetic fields using the Rayleigh-Taylor fingers now seen for the first time with the HST data. These will be compared with our radio polarization and our radio and X-ray proper motion measurements to test this shear amplification picture. Finally, we will use ionization state, structure, compositional differences, and dynamical information derived from the the optical and X-ray data to determine how cosmic ray acceleration, as measured by radio spectral index, is regulated in SNRs. The HST data now allow us to remedy the incomplete physical pictures derived from the individual wavebands separately, and make major steps in understanding the coupling between the multiple plasmas which control the dynamics and radiative properties of Cas A.
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