327-MHz Giant Metrewave Radio Telescope observations of one candidate and three Galactic supernova remnants

Abstract

Results from the 327-MHz Giant Metrewave Radio Telescope (GMRT) observations of four fields [three fields containing Galactic supernova remnants (SNRs) (G001.4-0.1, G003.8+0.3 and G356.3-1.5) and one field containing a candidate SNR (G004.2+0.0)] are reported in this paper. These fields were selected from the 843-MHz survey conducted by Gray using the Molonglo Synthesis Telescope. All three SNRs are detected in the GMRT images. A significant amount of thermal emission is seen at the location of the candidate SNR, and the GMRT image shows a discrete source of emission which is consistent with it being a flat-spectrum thermal source. An incomplete arc of emission with a compact central source detected in one of the fields is coincident with the extended OH(1720MHz) emission reported earlier. Possible implications of this morphology and correlation with the OH(1720 MHz) emission are also discussed.