论文标题
tycho的超新星残留物中非热X射线条纹的时间变异性与Chandra
Time Variability of Nonthermal X-ray Stripes in Tycho's Supernova Remnant with Chandra
论文作者
论文摘要
分析Tycho的Chandra数据的数据数据，在2000年，2003年，2007年，2009年和2015年中获取，我们在SNR的西南部搜索了同步X射线的时间变量特征，以前发现了硬X射线发射的条纹结构。通过比较在每个时期获得的X射线图像，我们发现条纹区域最北端的一个类似结的结构变得更加明亮，尤其是在2015年。我们还发现，随着它向外移动，它逐渐变得越来越轻松，变得更狭窄。我们的频谱分析表明，不仅非热X射线通量，而且还不仅是结构的光子指数，每年都会变化。在2000年至2015年期间，小结显示了$ \ sim 70 \％$的亮度和$Δγ\ sim 0.45 $的硬化。如果将磁场放大到$ \ sim 100〜 \ mathrm {μg} $和/或如果磁性随时间变化显着变化，则可以解释时间变异性。
Analyzing Chandra data of Tycho's supernova remnant (SNR) taken in 2000, 2003, 2007, 2009, and 2015, we search for time variable features of synchrotron X-rays in the southwestern part of the SNR, where stripe structures of hard X-ray emission were previous found. By comparing X-ray images obtained at each epoch, we discover a knot-like structure in the northernmost part of the stripe region became brighter particularly in 2015. We also find a bright filamentary structure gradually became fainter and narrower as it moved outward. Our spectral analysis reveal that not only the nonthermal X-ray flux but also the photon indices of the knot-like structure change from year to year. During the period from 2000 to 2015, the small knot shows brightening of $\sim 70\%$ and hardening of $ΔΓ\sim 0.45$. The time variability can be explained if the magnetic field is amplified to $\sim 100~\mathrm{μG}$ and/or if magnetic turbulence significantly changes with time.
