Numerically modelling the Cygnus Loop as a remnant evolved in an anisotropic cavity
Numerically modelling the Cygnus Loop as a remnant evolved in an anisotropic cavity
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对天鹅座环进行数值模拟，将其视为各向异性空腔中演化的残余物
DOI：
10.1093/mnras/stw2473
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发表时间：
2017
影响因子：
4.8
通讯作者：
Zhang Li
中科院分区：
文献类型：
--
作者：
Fang Jun;Yu Huan;Zhang Li
在X射线照片上，天鹅座环（Cygnus Loop）这一中年超新星遗迹的形态十分奇特，在其南部区域有一个爆发区，在其西部区域有一个隆起，在其东部区域有一个平面状的边缘，在爆发区的东西激波剖面之间存在着不对称性。形成这种奇特的冲击波轮廓的详细过程仍然不清楚。我们进行三维流体动力学模拟的残留物，重新审视其演变。在模拟中，先驱者产生了各向异性的、与纬度相关的风，并且沿着与风的对称轴不一致的方向行进。结果，产生具有边缘结构的腔。该遗迹在洞穴中演化了约104年。在东北部，激波首先遇到弓形激波，这部分对应于明亮的东北部地区。南吹是由于激波进入无扰动风中而形成的，激波与空腔的相互作用导致了激波结构的其他特殊特征。由此产生的残留物轮廓与X线片显示的一致。可以得出结论，超新星爆发发生在由各向异性恒星风产生的空腔中，经历了两个具有不同风速的主要阶段。
The morphology of the middle-aged supernova remnant, Cygnus Loop, seen in X-rays, is peculiar, with a blowout in the south region and other irregular features, such as a bump in the west, a limb with a planar morphology in the east and asymmetry between the east and the west shock profiles of the blowout. The detailed process of the formation of the peculiar profile of the shock is still unclear. We perform three-dimensional hydrodynamical simulations for the remnant to revisit its evolution. In the simulations, the progenitor ejects an anisotropic, latitude-dependent wind, and travels in a direction that is not aligned with the symmetry axis of the wind. As a result, a cavity with a fringed structure is produced. The remnant has evolved in the cavity for about 104yr. In the north-east, the shock has first encountered the bow shock, and this part corresponds to the bright north-eastern region. The south blowout is formed due to the shock travelling into the undisturbed wind, and the interaction of the shock with the cavity leads to the other peculiar features of the shock structure. The resulting profile of the remnant is consistent with that indicated in X-rays. It can be concluded that the supernova explosion occurred in the cavity produced by an anisotropic stellar wind experiencing two main phases with different wind velocities.
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DOI：
10.1086/163843
发表时间：
1986-01
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. J. Hester-J.;D. Cox
通讯作者：
J. J. Hester-J.;D. Cox
DOI：
10.1086/523263
发表时间：
2007-10
期刊：
The Astrophysical Journal
影响因子：
--
作者：
H. Tsunemi;S. Katsuda;N. Nemes;E. Miller
通讯作者：
H. Tsunemi;S. Katsuda;N. Nemes;E. Miller
DOI：
10.1111/j.1365-2966.2010.16684.x
发表时间：
2010-03
影响因子：
4.8
作者：
Xin Zhou;F. Bocchino;M. Miceli;S. Orlando;Yang Chen
通讯作者：
Xin Zhou;F. Bocchino;M. Miceli;S. Orlando;Yang Chen
影响因子：
6.5
作者：
S. Orlando;O. Petruk;F. Bocchino;M. Miceli
通讯作者：
S. Orlando;O. Petruk;F. Bocchino;M. Miceli
影响因子：
4.8
作者：
D. Meyer;N. Langer;J. Mackey;P. Velázquez;A. Gusdorf
通讯作者：
D. Meyer;N. Langer;J. Mackey;P. Velázquez;A. Gusdorf