Abstract
The new supernova remnant G109.1–1.0 has important X-ray and radio parallels to the SS433–W50 pair. We have obtained a spectrum of the faint optical filaments associated with the large shell-like radio source. The spectrum shows strong [S II] λλ 6,717,6,731 emission relative to Hα, which is characteristic of shock-heated gas and which confirms that the filaments are part of the supernova remnant, and is generally similar to spectra of the Cygnus Loop. By assuming pressure equilibrium between the optical filaments and the interior of the remnant, we find an initial energy of 3 × 1051 erg, which is higher than that found from X-ray measurements. When compared with W50, the G109.1–1.0 remnant has filaments of higher density, and weaker [N II] emission.
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Blair, W., Kirshner, R. Optical spectrum of the unusual supernova remnant G109.1–1.0. Nature 291, 132–133 (1981). https://doi.org/10.1038/291132a0
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DOI: https://doi.org/10.1038/291132a0
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