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A combination of archival multi-frequency radio observations with narrow-bandHAlpha optical imagery and new confirmatory optical spectroscopy have shownthat candidate supernova remnant G6.31+0.54 can now be confirmed as part of aGalactic supernova remnant (SNR). It has non-thermal emission, an opticalemission line spectrum displaying shock excitation and standard SNR lineratios, fine filamentary structures in HAlpha typical of optical remnants andclosely overlapping radio and optical footprints. An X-ray ROSAT source 1RXSJ175752.1-231105 was also found that matches the radio and optical emissionthough a definite association is not proven. Nevertheless, taken together, allthese observed properties point to a clear SNR identification for this source.We provide a rough estimate for the kinematic distance to G6.31+0.54 of~4.5kpc. The detected optical filaments are some ~10arcminutes in extent (orabout 13 pc at the assumed distance). However, as only a partial arcuatestructure of the SNR can be seen (and not a full shell) the full angular extentof the SNR is unclear. Hence the physical extent of the observed partial shellis also difficult to estimate. If we assume an approximately circular shellthen a conservative fit to the optical arc shaped filaments gives an angulardiameter of ~20 arcminutes corresponding to a physical diameter of ~26 pc thatshows this to be an evolved remnant.

Confirmation of G6.31+0.54 as a part of a Galactic supernova remnant