On the origin of the asymmetry of the ejecta structure and explosion of G350.1$-$0.3

TL;DR

This study uses X-ray observations from Chandra and Suzaku to measure the 3D velocities of ejecta in supernova remnant G350.1$-$0.3, revealing asymmetric explosion features and constraining its age to about 655 years.

Contribution

First detailed 3D kinematic analysis of G350.1$-$0.3's ejecta, linking proper motions and spectral data to understand explosion asymmetry and remnant origin.

Findings

Maximum ejecta velocity of 4640 km/s in the east

Ejecta's 3D velocities estimated at 3000-5000 km/s

Remnant's age constrained to at most 655 years

Abstract

We present X-ray analysis of the ejecta of supernova remnant G350.1$-$0.3 observed with Chandra and Suzaku, and clarify the ejecta's kinematics over a decade and obtain a new observational clue to understanding the origin of the asymmetric explosion. Two images of Chandra X-ray Observatory taken in 2009 and 2018 are analyzed in several methods, and enable us to measure the velocities in the plane of the sky. A maximum velocity is 4640$\pm$290 km s$^{-1}$ (0.218$\pm$0.014 arcsec yr$^{-1}$) in the eastern region in the remnant. These findings trigger us to scrutinize the Doppler effects in the spectra of the thermal emission, and the velocities in the line-of-sight direction are estimated to be a thousand km s$^{-1}$. The results are confirmed by analyzing the spectra of Suzaku. Combining the proper motions and line-of-sight velocities, the ejecta's three-dimensional velocities are $\sim$3000-5000 km s$^{-1}$. The center of the explosion is more stringently constrained by finding the optimal time to reproduce the observed spatial expansion. Our findings that the age of the SNR is estimated at most to be 655 years, and the CCO is observed as a point source object against the SNR strengthen the 'hydrodynamical kick' hypothesis on the origin of the remnant.