In this work we present new high resolution observations of the supernova remnant (SNR) G308.4-1.4 using the Australia Telescope Compact Array (ATCA) in the 6B and 750B arrays. These observations, obtained with the Compact Array Broadband Backend (CABB), span a 2 GHz band width split in 2049 channels. Such configuration allowed us to construct images at different frequencies from 1 to 3 GHz. A spatial resolution of 9.8 arcsec× 9.6 arcsec was achieved at 2.36 GHz, improving former images in the literature by an order of magnitude. Our maps reveal details not observed previously, showing in particular the internal structure of two bright, compact regions overlapping the northern elliptical shell. Applying the T-T plot method, we estimated the spectral index distribution in different regions throughout the SNR so as to determine a possible link between the observed structures,mainly the two compact regions of uncertain connection with the SNR. We also analyze the polarization of the radio emission.
Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
- Pub Date:
- July 2021
- ISM: individual objects (G308.4-1.4);
- ISM: supernova remnants;
- radio continuum: ISM