Speaker
Description
Detecting a supernova remnant (SNR) along the Galactic plane can be challenging. Any new detection reduces the discrepancy between the expected and known number of remnants.
We present results from a large selection of radio and X-ray data that cover the position of G321.3-3.9. We identified G321.3-3.9 as a new SNR using data collected by several radio surveys, spanning a frequency range from 200 to 2300 MHz. Stacked eROSITA data from four consecutive all-sky surveys (eRASS:4) provide spectro-imaging information in the energy band 0.2-8.0 keV.
G321.3-3.9 has an elliptical shape with major and minor axes of about $1.7^{\circ} \times 1.1^{\circ}$. From CHIPASS and S-PASS data, we calculate a spectral index $\alpha = -0.8 \pm 0.2$, consistent with synchrotron emission from an expanding shell in the Sedov Taylor phase. The eROSITA data show an X-ray diffuse structure filling almost the entire radio shell.
Based on our spectral analysis, we found the temperature to be approximately 0.6 keV and the column absorption density about $10^{21}$ cm$^{-2}$. Comparing this absorption density to optical extinction maps, we estimate the distance to fall within the range of (1.0 - 1.7) kpc, considering the $1 \sigma$ uncertainty range.
