Temporal and spatial variation of synchrotron X-ray stripes in Tycho’s supernova remnant
Temporal and spatial variation of synchrotron X-ray stripes in Tycho’s supernova remnant
复制标题
第谷超新星遗迹中同步加速器X射线条纹的时空变化
DOI：
10.1093/pasj/psaa075
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发表时间：
2020
影响因子：
2.3
通讯作者：
Tsuru Takeshi Go
中科院分区：
文献类型：
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作者：
Matsuda Masamune;Tanaka Takaaki;Uchida Hiroyuki;Amano Yuki;Tsuru Takeshi Go
在第谷超新星遗迹（SNR）中发现的同步加速器X射线“条纹”一直吸引着人们的注意，因为它们可能是质子加速到PeV的证据。我们分析了2003年，2007年，2009年和2015年拍摄的Chandra数据，用于SNR西南地区条纹的成像和光谱学。比较在不同时期获得的图像，我们发现，同步辐射X射线的时间变化不仅限于两个结构以前报道，但在该地区更常见。对9个亮条纹的光谱分析不仅揭示了它们的时间变化，而且揭示了表面亮度和光子指数之间的强反相关性。九个条纹的光谱具有光子指数r = 2.1-2.6，并且比在相同区域中具有r = 2.7-2.9的SNR的外缘的光谱明显更硬。基于这些发现，我们表明，磁场被大幅放大，并建议粒子加速通过一个随机过程可能是在工作中的条纹。
The synchrotron X-ray “stripes” discovered in Tycho’s supernova remnant (SNR) have been attracting attention as they may be evidence for proton acceleration up to PeV. We analyzed Chandra data taken in 2003, 2007, 2009, and 2015 for imaging and spectroscopy of the stripes in the southwestern region of the SNR. Comparing images obtained at different epochs, we find that time variability of synchrotron X-rays is not limited to two structures previously reported but is more common in the region. Spectral analysis of nine bright stripes reveals not only their time variabilities but also a strong anti-correlation between the surface brightness and photon indices. The spectra of the nine stripes have photon indices of Γ = 2.1–2.6 and are significantly harder than those of the outer rim of the SNR in the same region with Γ = 2.7–2.9. Based on these findings, we indicate that the magnetic field is substantially amplified, and suggest that particle acceleration through a stochastic process may be at work in the stripes.