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 similar to 8 degrees 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-X = 4.4(-1.4)(+1.4) X 10(34) erg s(-1) for the cooler component and L-X = 4.4(-1.5)(+1.8) X 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-X = 8.4 x 10(34) erg s(-1) and L-X = 6.7(-0.9)(+1.1) X 10(36) erg s(-1).