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A multiwavelength study of the radio source G296.7−0.9: confirmation as a Galactic supernova remnant



Australian Laureate fellow.


We present a multiwavelength study of the radio source G296.7−0.9. This source has a bilateral radio morphology, a radio spectral index of −0.5 ± 0.1, sparse patches of linear polarization and thermal X-rays with a bright arc near the radio boundary. Considering these characteristics, we conclude that G296.7−0.9 is a supernova remnant (SNR). The age and morphology of the SNR in the context of its environment suggest that the source is co-located with an H ii region, and that portions of the shock front have broken out into a lower density medium. We see no evidence for a neutron star or pulsar wind nebula associated with SNR G296.7−0.9.