Probing the Dynamics and Shock Physics of the Cas A Supernova Remnant

Details Probing the Dynamics and Shock Physics of the Cas A Supernova Remnant Probing the Dynamics and Shock Physics of the Cas A Supernova Remnant

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9890f&link_type=abstract

HST Proposal ID #9890

Physics

Hst Proposal Id #9890 Ism And Circumstellar Matter

Scientific paper

Cassiopeia A {Cas A; SN 1680} is the youngest known and closest example of an oxygen-rich, core-collapse supernova remnant. A two-year WFPC2 survey of part of the remnant yielded many new insights including realization of the stunning amount of fine-scale detail present in the ejecta, and the first precise location of the reverse shock front in the main shell via rapid emission and structural changes visible over 2 yrs. In addition, these data revealed over 100 new ejecta knots located out ahead of the forward blast wave in a small region where only a handful were known from ground-based images. We propose a follow-up survey program aimed at obtaining hi-res images of the entire remnant in the ejecta's four major emission lines. A separate set of ACS and NIC3 [Si VI] images of the NW reverse shock filaments will be taken 3-4 months following the main Cycle 12 survey images. These will allow us to the trace individual ejecta knot deceleration dynamics, excitation, and evolution during reverse shock passage. Analysis of the emission line fluxes will make use of custom shock models generated by us for Cas A. These data will also provide data on outer knot chemistry and expansion asymmetries particularly in regard to the collimation of the NE and SW jets of O, Si, Ca-rich ejecta. A major aim of this program is to acquire a superb two-year image database covering the entire remnant to allow a detailed shock physics and dynamics study.

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