SN1978K: Probing the Shocked Ejecta of a Young REMNANT:CYCLE4 Medium

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Hst Proposal Id #5363 Interstellar Medium Sn&Snr

Scientific paper

SN1978K, in the barred galaxy NGC 1313, is the ONLY example of a very young supernova remnant of KNOWN age which is X-ray bright. The X-rays likely arise from the blast wave encountering the circumstellar medium. We propose to study the ultraviolet line emission from this remnant, which in such a young remnant, should be exceedingly rich, especially in [Fe II] lines. Other lines give additional density and abundance diagnostics. The UV spectrum is expected to evolve rapidly over the next few years. We hope to study the age-dependent development of the remnant in an external galaxy. SN1987A in the LMC and SN1993J in M81 will undergo the same phenomenon about a decade or so from now. A study of SN1978K now will shed light on issues to be resolved with observations of SN1987A and SN1993J.

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