A New Look at the "Jet" in the CTB 37A/B Supernova Remnant Complex
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Very Large Array observations of the unusual southern Galactic supernova remnant SNR complex near l 348 degrees, b 0 degrees at wavelengths of 6, 20, and 90 cm are presented. Derived continuum spectra and observed morphologies indicate that G348.50.1 CTB 37A does not have a jet as reported by previous observers but is instead superposed on a second, previously unidentified SNR lying along the line of sight. This new SNR is designated G348.5-0.0 according to the usual convention. Other observers have also noted a faint, flat spectrum bridge of emission possibly connecting the G348.50.1G348.5-0.0 superposition with a third nearby remnant G348.70.3 CTB 37B. However, a connection appears unlikely, and we suggest that the bridge merely consists of faint emission which has leaked from the southeastern side of G348.70.3 and has no relation to the G348.50.1G348.5-0.0 superposition. These new data also reveal a remarkable region of blown-out emission from the southwestern part of G348.50.1 which most likely reflects the presence of large-scale density inhomogeneities in the interstellar medium into which the SNR shell is expanding.