Spectrum of the supernova remnant W50

Abstract
Nebulosity associated with the supernova remnant W50 is collisionally excited ([SII]/Hα ~ 2), highly reddened (AV = 4.5) and has a large radial velocity (166 km s–1). It also has abnormally strong [N II] lines ([N II]/Hα ~ 5), Puppis-A being the only other supernova remnant showing such an anomaly. The large reddening is not inconsistent with the suggestion that the peculiar emission-line object and X-ray source SS433 is associated with W50.

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