Direct Ejecta Velocity Measurements of Tycho's Supernova Remnant
Direct Ejecta Velocity Measurements of Tycho's Supernova Remnant
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DOI：
10.3847/1538-4357/aa6f60
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
Toshiki Sato;J. Hughes
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文献类型：
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作者：
Toshiki Sato;J. Hughes
我们提出了第谷超新星遗迹（SNR）的第一个直接喷出物速度测量。钱德拉的高角分辨率图像揭示了喷出物中径向速度的斑块结构，可以分为明显的红移，蓝移和低速喷出物团块或斑点。红移和蓝移斑点的典型速度分别是107800和105000 km s−1。最高速度的斑点位于中心附近，而低速的斑点出现在边缘附近，这与一般球形膨胀的预期一致。增益校准的速度测量的系统不确定性进行评估，通过进行联合适合的ACIS-I和ACIS-S探测器的个人斑点。我们确定的三维运动学的Si-和Fe-丰富的团块在东南（SE）象限，并表明这些结形成一个独特的，紧凑的，和运动学连接的结构，甚至可能是一个链的结串沿着遗迹的边缘。通过检查观察的几何形状，我们得出结论，在SE区域的结是不太可能负责的高速钙II吸收功能中看到的SN 1572，起源事件第谷的SNR的光回波光谱。
We present the first direct ejecta velocity measurements of Tycho’s supernova remnant (SNR). Chandra’s high angular resolution images reveal a patchy structure of radial velocities in the ejecta that can be separated into distinct redshifted, blueshifted, and low velocity ejecta clumps or blobs. The typical velocities of the redshifted and blueshifted blobs are ≲7800 and ≲5000 km s−1, respectively. The highest velocity blobs are located near the center, while the low velocity ones appear near the edge as expected for a generally spherical expansion. Systematic uncertainty on the velocity measurements from gain calibration was assessed by carrying out joint fits of individual blobs with both the ACIS-I and ACIS-S detectors. We determine the three-dimensional kinematics of the Si- and Fe-rich clumps in the southeastern (SE) quadrant and show that these knots form a distinct, compact, and kinematically connected structure, possibly even a chain of knots strung along the remnant’s edge. By examining the viewing geometries, we conclude that the knots in the SE region are unlikely to be responsible for the high velocity Ca ii absorption features seen in the light-echo spectrum of SN 1572, the originating event for Tycho’s SNR.