2009MNRAS.399..177G

G35.6-0.4 is an extended radio source in the Galactic plane which has previously been identified as either a supernova remnant or an Hii region. Observations from the Very Large Array Galactic Plane Survey at 1.4 GHz with a resolution of 1 arcmin allow the extent of G35.6-0.4 to be defined for the first time. Comparison with other radio survey observations show that this source has a non-thermal spectral index, with S ∝ ν^{–0.47±0.07}. G35.6-0.4 does not have obvious associated infrared emission, so it is identified as a Galactic supernova remnant, not an Hii region. It is ~15x11arcmin² in extent, showing partial limb brightening.