Evolutionary Models for 43 Galactic Supernova Remnants with Distances and X-ray Spectra

Abstract

The X-ray emission from a supernova remnant (SNR) is a powerful diagnostic of the state of the shocked plasma. The temperature (kT) and the emission measure (EM) of the shocked-gas are related to the energy of the explosion, the age of the SNR, and the density of the surrounding medium. Progress in X-ray observations of SNRs has resulted in a significant sample of Galactic SNRs with measured kT and EM values. We apply spherically symmetric SNR evolution models to a new set of 43 SNRs to estimate ages, explosion energies, and circumstellar medium densities. The distribution of ages yields a SNR birth rate. The energies and densities are well fit with log-normal distributions, with wide dispersions. SNRs with two emission components are used to distinguish between SNR models with uniform ISM and with stellar wind environment. We find type Ia SNRs to be consistent with a stellar wind environment. Inclusion of stellar wind SNR models has a significant effect on estimated lifetimes and explosion energies of SNRs. This reduces the discrepancy between the estimated SNR birthrate and the SN rate of the Galaxy.

57 pages, 7 figures, this replacement corrects an error in Section 5.4 on the correction to SNR birthrate and mean energy caused by stellar wind SNRs (the fraction was revised upward from 0.3 to 0.4)

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