The evolution of magnetic field and spin‐down of young pulsars
The evolution of magnetic field and spin‐down of young pulsars
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DOI：
10.1002/asna.201913710
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发表时间：
2019-12
影响因子：
0.9
通讯作者：
Z. F. Gao;F. Peng;Na Wang
中科院分区：
文献类型：
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作者：
Z. F. Gao;F. Peng;Na Wang
在这里，我们总结了我们最近在磁场演化和年轻脉冲星（包括高 B 脉冲星和磁星）自旋下降方面的工作。我们的工作包括以下三个部分：（a）根据其潜在相关超新星遗迹（SNR）的估计年龄，我们估计了具有SNR的八颗磁星的平均制动指数值，发现五颗磁星的平均制动指数较小，为1 <n< 3，并结合磁偶极辐射和风辅助制动来解释它们。 (b) PSR J1734-3333 的低制动指数 n= 0.9(2) 在超新星爆炸中形成后不久可能会经历超临界吸积。埋藏的多极磁场将合并成偶极磁场。保持当前场增长指数ϵ= 1.34，50 kys和100 kys后，这颗脉冲星将分别成为dBp∼6.2(2) × 1014G和dBp∼1.06(4) × 1015G的磁星。 (c) 通过引入平均旋转能量转换系数，并将脉冲星的高能和定时观测与可靠的核状态方程相结合，我们估计了 PSR J1640-4631 的初始自旋周期、初始偶极子磁场和真实年龄。对于该源，其测得的高制动指数n= 3.15(3)归因于长期偶极子磁场衰减，其软X射线发射归因于各向异性加热。
Here, we summarize our recent work on the evolution of magnetic field and spin‐down of young pulsars including high‐B pulsars and magnetars. Our work includes the following three parts: (a) Based on the estimated ages of their potentially associated supernova remnants (SNRs), we estimate the values of the mean braking indices of eight magnetars with SNRs and find that five magnetars have smaller mean braking indices of 1 <n< 3, and we interpret them within a combination of magnetodipole radiation and wind‐aided braking. (b) The low braking index ofn= 0.9(2) for PSR J1734‐3333 could undergo a supercritical accretion soon after its formation in a supernova explosion. The buried multipole magnetic fields will merge into a dipole magnetic field. Retaining the current field growth indexϵ= 1.34, this pulsar will become a magnetar withdBp∼6.2(2) × 1014G anddBp∼1.06(4) × 1015G after 50 kyrs and 100 kys, respectively. (c) By introducing a mean rotation energy conversion coefficient and combining the pulsar's high‐energy and timing observations with a reliable nuclear equation of state, we estimate the initial spin period, initial dipole magnetic field, and true age of PSR J1640‐4631. For this source, its measured high braking indexn= 3.15(3) is attributed to a long‐term dipole magnetic field decay, and its soft X‐ray emission is attributed to anisotropic heating.