A new candidate supernova remnant G 70.5+1.9

A compact complex of line emission filaments in the galactic plane has the appearance of those expected of an evolved supernova remnant though non-thermal radio and X-ray emission have not yet been detected. This optical emission line region has now been observed with deep imagery and both low and high-dispersion spectroscopy. Diagnostic diagrams of the line intensities from the present spectra and the new kinematical observations both point to a supernova origin. However, several features of the nebular complex still require an explanation within this interpretation.

💡 Research Summary

The paper presents a comprehensive optical investigation of a compact filamentary emission complex located at Galactic coordinates G 70.5+1.9, proposing it as a new candidate supernova remnant (SNR). The authors begin by noting that, although the region lacks any detected non‑thermal radio or X‑ray counterpart, its morphology—an intricate network of narrow filaments—strongly resembles that of evolved SNRs. To test the hypothesis, they obtained deep narrow‑band images in Hα,