THE THREE-DIMENSIONAL STRUCTURE OF CASSIOPEIA A
THE THREE-DIMENSIONAL STRUCTURE OF CASSIOPEIA A
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DOI：
10.1088/0004-637x/725/2/2038
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
T. Delaney;L. Rudnick;M. Stage;J. Smith;Karl Isensee;J. Rho;G. Allen;H. Gomez;T. Kozasa;W. Reach;John E. Davis;John C. Houck
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文献类型：
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作者：
T. Delaney;L. Rudnick;M. Stage;J. Smith;Karl Isensee;J. Rho;G. Allen;H. Gomez;T. Kozasa;W. Reach;John E. Davis;John C. Houck
我们使用斯皮策太空望远镜的红外光谱仪绘制了仙后座A在5到40 μm之间的几乎整个范围。利用红外和钱德拉X射线多普勒速度测量，沿着光学喷出物的位置以外的前向冲击，我们建立了一个三维模型的残留物。Cas A的结构可以被表征为球形组件、倾斜的厚盘、以及多个喷射物射流/活塞和光学快速移动的结，所有这些都填充在厚盘平面上。Cas A中的亮环表示厚平面/活塞和大致球形的反向激波之间的交点。喷出物活塞表明了爆炸中的径向速度梯度。一些喷射活塞是双极性的，具有围绕膨胀中心的相反方向的流动，而一些喷射活塞没有显示出这种对称性。一些喷出物活塞似乎保持了核燃烧层的完整性，而另一些则似乎穿透了外层。喷出物活塞表明了爆炸中的径向速度梯度。在三个维度上，东南部的Fe喷流占据了Si族发射的一个“洞”，并不像以前认为的那样代表“翻转”。虽然与星周介质的相互作用会影响残骸的详细外观，并可能影响东南Fe喷流的可见度，但大部分对称性和不对称性都是Cas A爆炸所固有的。
We used the Spitzer Space Telescope's Infrared Spectrograph to map nearly the entire extent of Cassiopeia A between 5 and 40 μm. Using infrared and Chandra X-ray Doppler velocity measurements, along with the locations of optical ejecta beyond the forward shock, we constructed a three-dimensional model of the remnant. The structure of Cas A can be characterized into a spherical component, a tilted thick disk, and multiple ejecta jets/pistons and optical fast-moving knots all populating the thick disk plane. The Bright Ring in Cas A identifies the intersection between the thick plane/pistons and a roughly spherical reverse shock. The ejecta pistons indicate a radial velocity gradient in the explosion. Some ejecta pistons are bipolar with oppositely directed flows about the expansion center while some ejecta pistons show no such symmetry. Some ejecta pistons appear to maintain the integrity of the nuclear burning layers while others appear to have punched through the outer layers. The ejecta pistons indicate a radial velocity gradient in the explosion. In three dimensions, the Fe jet in the southeast occupies a “hole” in the Si-group emission and does not represent “overturning,” as previously thought. Although interaction with the circumstellar medium affects the detailed appearance of the remnant and may affect the visibility of the southeast Fe jet, the bulk of the symmetries and asymmetries in Cas A are intrinsic to the explosion.