Global X-Ray Properties of the Vela and Puppis A Supernova Remnants

The Vela and Puppis A supernova remnants (SNRs) comprise a large emission region of ∼8° diameter in the soft X-ray sky. The HaloSat CubeSat mission provides the first soft X-ray (0.4-7 keV) observation of the entire Vela SNR and Puppis A SNR region with a single pointing and moderate spectral resolution. HaloSat observations of the Vela SNR are best fit with a two-temperature thermal plasma model consisting of a cooler component with ${{kT}}_{1}={0.19}_{-0.01}^{+0.01}$ keV in collisional ionization equilibrium and a hotter component with ${{kT}}_{2}={1.06}_{-0.27}^{+0.45}$ keV in nonequilibrium ionization. Observations of the Puppis A SNR are best fit with a single-component plane-parallel shocked plasma model with ${kT}={0.86}_{-0.05}^{+0.06}$ keV in nonequilibrium ionization. For the first time, we find the total X-ray luminosities of both components of the Vela SNR spectrum in the 0.5-7 keV energy band to be ${L}_{{\rm{X}}}={4.4}_{-1.4}^{+1.4}\times {10}^{34}$ erg s^-1 for the cooler component and ${L}_{{\rm{X}}}={4.1}_{-1.5}^{+1.8}\times {10}^{34}$ erg s^-1 for the hotter component. We find the total X-ray luminosities of the Vela and Puppis A SNRs to be ${L}_{{\rm{X}}}=8.4\times {10}^{34}$ erg s^-1 and ${L}_{{\rm{X}}}={6.7}_{-0.9}^{+1.1}\times {10}^{36}$ erg s^-1.