Sangwook

Our deep 640 ks {it Chandra} observation of the Galactic Type Ia supernova remnant (SNR) G299.2$-$2.9 show some peculiar characteristics. The central emission feature of the Si- and Fe-rich ejecta is generally-circular, but its western part is elongated all the way out to the westernmost outer boundary of the SNR. The central ejecta feature shows a higher Fe/Si abundance ratio in the northern half. Surrounding these ejecta features are multiple shells of the swept-up medium. The radial density profile of the bright inner shell suggests the shock interaction with a uniform medium, but the faint outer shell is likely emission from the shock propagating into a stellar wind. We place a conservative upper limit of $sim$8 kpc for the distance to this SNR. At this distance we estimate low values for the explosion energy ($E_0$ < $sim$5 $times$ 10$^{50}$ erg) and the Fe ejecta mass ($sim$0.2 $M_{odot}$).