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arXiv 1106.4498astro-ph.GA
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最年轻的银河系超新星遗迹G1 .9+0.3的膨胀

Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3

A. K. Carlton, K. J. Borkowski, S. P. Reynolds, U. Hwang, R. Petre, D. A. Green, K. Krishnamurthy, R. Willett

摘要:

我们对银河系最年轻的超新星遗迹G1.9+0.3的膨胀和增亮进行了测量,并将2007年和2009年获得的钱德拉X射线图像进行了比较。一个简单的均匀膨胀模型很好地描述了数据,给出的膨胀率为0.642 +/-0.049% yr^-1,通量增加为1.7 +/-1.0% yr^-1。如果没有减速,那么剩余年龄将是156 +/- 11年,与早期的结果一致。由于减速肯定发生过,这个年龄是上限;我们估计年龄约为110年,或爆炸日期约为1900年。通量的增加与无线电波长的报告增加相当。G1.9+0.3是唯一一个流量增加的银河系超新星遗迹,对冲击波中电子加速的物理学有影响

英文摘要:

We present a measurement of the expansion and brightening of G1.9+0.3, the youngest Galactic supernova remnant, comparing Chandra X-ray images obtained in 2007 and 2009. A simple uniform expansion model describes the data well, giving an expansion rate of 0.642 +/- 0.049 % yr^-1, and a flux increase of 1.7 +/- 1.0 % yr^-1. Without deceleration, the remnant age would then be 156 +/- 11 yr, consistent with earlier results. Since deceleration must have occurred, this age is an upper limit; we estimate an age of about 110 yr, or an explosion date of about 1900. The flux increase is comparable to reported increases at radio wavelengths. G1.9+0.3 is the only Galactic supernova remnant increasing in flux, with implications for the physics of electron acceleration in shock waves

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