GMRT observations of four suspected supernova remnants near the Galactic Centre |
| |
| Authors: | Subhashis Roy A Pramesh Rao |
| |
| Institution: | National Centre for Radio Astrophysics (TIFR), Pune University Campus, Post Bag No.3, Ganeshkhind, Pune 411 007, India |
| |
| Abstract: | We have observed two fields – Field I  ,  and Field II  ,  – with the Giant Metrewave Radio Telescope (GMRT) at 330 MHz. In the first field, we have studied the candidate supernova remnant (SNR) G3.1?0.6 and, based on its observed morphology, spectral index and polarization, confirmed it to be an SNR. We find this supernova to have a double ring appearance with a strip of emission on its western side passing through its centre.
We have discovered two extended curved objects in the second field, which appears to be part of a large shell-like structure. It is possibly the remains of an old supernova in the region. Three suspected SNRs, G356.3?0.3, G356.6+0.1 and G357.1?0.2, detected in the MOST 843-MHz survey of the GC region appear to be located on this shell-like structure. While both G356.3?0.3 and G356.6+0.1 seem to be parts of this shell, G357.1?0.2, which has a steeper spectrum above 1 GHz, could be a background SNR seen through the region. Our H i absorption observation towards the candidate SNR G357.1?0.2 indicates that it is at a distance of more than 6 kpc from us. |
| |
| Keywords: | ISM: individual: G3 1?0 6 ISM: individual: G356 3?0 3 ISM: individual: G356 6+0 1 ISM: individual: G357 1?0 2 supernova remnants Galaxy centre |
|
|
