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arXiv 1808.04716astro-ph.GAastro-ph.HE
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15颗新距离银河系超新星遗迹的演化模型

Evolutionary Models for 15 Galactic Supernova Remnants with New Distances

D. A. Leahy, S. Ranasinghe

摘要:

最近利用21 cm HI线和$^{13}$ CO线对银河系内部的观测研究,获得了30个银河系超新星遗迹(SNRs)的新距离。其中15个残骸已经观测到X射线光谱,并测量了冲击气体的温度和排放量。在这里,我们应用球对称SNR演化模型,这15个遗迹,以获得估计的年龄,爆炸能量,星周介质密度和配置文件(均匀或风型)。从年龄的分布,我们得到了超新星的诞生率和估计的不完整性。能量和密度可以很好地拟合对数正态分布。爆炸能量的分布与大麦云云(LMC)中的超新星爆炸非常相似,表明LMC中的超新星爆炸与银河系中的超新星爆炸非常相似。银河系信噪比的密度分布比大麦哲伦星系信噪比的平均密度高出$\sim$ 2.5倍。

英文摘要:

Recent studies using 21 cm HI line and $^{13}$CO line observations in the inner part of the Galaxy have resulted in new distances for 30 Galactic supernova remnants (SNRs). 15 of those remnants have observed X-ray spectra, for which shocked-gas temperatures and emission measures are measured. Here we apply spherically symmetric SNR evolution models to these 15 remnants to obtain estimates for ages, explosion energies, circum-stellar medium densities and profiles (uniform or wind-type).From the distribution of ages we obtain a supernova birth rate and estimate incompleteness. The energies and densities can be well fit with log-normal distributions. The distribution of explosion energies is very similar to that of SNRs in the Large Magellanic Cloud (LMC), suggesting SN explosions in the LMC and in the Galaxy are very similar. The density distribution has higher mean density for Galactic SNRs than for LMC SNRs, by a factor $\sim$2.5.

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