Abstract
X-ray observations with the Einstein Observatory show that the supernova remnant (SNR) in the galaxy NGC 4449 is the most luminous known X-ray SNR - a distinction it already holds at optical and radio wavelengths. New optical spectroscopy and the X-ray data indicate that the extraordinary luminosity is due to chemically enriched material at unusually high densities. A model in which the remnant resulted from the explosion of a massive star in a medium of density near 25 cm<SUP>-3</SUP> about 100 years ago is consistent with all of the data. In this picture the X-rays stem from chemically enriched supernova ejecta heated by a reverse shock.
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