论文标题
具有距离和X射线光谱的43个银河超新星残留物的进化模型
Evolutionary Models for 43 Galactic Supernova Remnants with Distances and X-ray Spectra
论文作者
论文摘要
超新星残留物（SNR）的X射线发射是对冲击血浆状态的有力诊断。冲击气体的温度（KT）和发射度量（EM）与爆炸能量，SNR的年龄和周围介质的密度有关。 SNR的X射线观察的进展已导致具有测得的KT和EM值的银河系SNR样本。我们将球形对称的SNR进化模型应用于新的43个SNR集，以估计年龄，爆炸能量和室内密度。年龄的分布产生SNR出生率。能量和密度非常适合对数正态分布，具有广泛的分散。具有两个发射成分的SNR用于区分具有均匀ISM的SNR模型和具有恒星风环境的SNR模型。我们发现IA型SNR与恒星风环境一致。包括恒星风SNR模型对SNR的估计寿命和爆炸能量具有重大影响。这降低了估计的SNR出生率与银河系的SN速率之间的差异。
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.
