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arXiv 1608.02113astro-ph.HE
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在后备盘存在下磁星的旋转演化

Rotational evolution of magnetars in the presence of a fallback disk

H. Tong, W. Wang, X. W. Liu, R. X. Xu

摘要:

磁星可能有很强的表面偶极场。在观测上,两个磁星可能有被动的后备磁盘。在后备磁盘的存在下,磁星的旋转演化可能会改变。在自相似回退盘模型中,发现:(1)当回退盘质量显著小于$10^{-6} \,\rm M_{\odot}$时,磁星不受回退盘的影响,为正常磁星。(2)当盘的质量很大,但磁星的表面偶极场大约或低于$10^{14} \,\rm G$,磁星也将是一个正常的磁星。一个磁星加上一个被动后备磁盘系统是预期的。这可能对应于磁星4U 0142 $+$ 61和磁星1E 2259 $+$ 586的观测结果。(3)当盘质量较大,磁星表面偶极场高达$4\times 10^{15} \,\rm G$时,磁星将从喷射相演化到推进相,然后进入旋转平衡。磁星在推进阶段会很快减速。最后的旋转周期可以高达$2\times 10^4 \,\rm s$。这可能对应于超新星遗迹RCW 103中的超慢磁星。因此,可以统一理解这三种磁星。

英文摘要:

Magnetars may have strong surface dipole field. Observationally, two magnetars may have passive fallback disks. In the presence of a fallback disk, the rotational evolution of magnetars may be changed. In the self-similar fallback disk model, it is found that: (1) When the disk mass is significantly smaller than $10^{-6} \,\rm M_{\odot}$, the magnetar is unaffected by the fallback disk and it will be a normal magnetar. (2) When the disk mass is large, but the magnetar's surface dipole field is about or below $10^{14} \,\rm G$, the magnetar will also be a normal magnetar. A magnetar plus a passive fallback disk system is expected. This may correspond to the observations of magnetars 4U 0142$+$61, and 1E 2259$+$586. (3) When the disk mass is large, and the magnetar's surface dipole field is as high as $4\times 10^{15} \,\rm G$, the magnetar will evolve from the ejector phase to the propeller phase, and then enter rotational equilibrium. The magnetar will be slowed down quickly in the propeller phase. The final rotational period can be as high $2\times 10^4 \,\rm s$. This may correspond to the super-slow magnetar in the supernova remnant RCW 103. Therefore, the three kinds of magnetars can be understood in a unified way.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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