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On the angular momentum extraction from the rotation powered pulsars
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-07-30 , DOI: 10.1093/mnras/stab2206
Shinpei Shibata 1 , Shota Kisaka 2
Affiliation  

The rotation powered pulsar loses angular momentum at a rate of the rotation power divided by the angular velocity Ω*. This means that the length of the lever arm of the angular momentum extracted by the photons, relativistic particles, and wind must be on average c/Ω*, which is known as the light cylinder radius. Therefore, any deposition of the rotation power within the light cylinder causes insufficient loss of angular momentum. In this paper, we investigate two cases of this type of energy release: polar cap acceleration and Ohmic heating in the magnetospheric current inside the star. As for the first case, the outer magnetosphere beyond the light cylinder is found to compensate the insufficient loss of the angular momentum. We argue that the energy flux coming from the sub-rotating magnetic field lines must be larger than the solid-angle average value, and as a result, an enhanced energy flux emanating beyond the light cylinder is observed in different phases in the light curve from those of emission inside the light cylinder. As for the second case, the stellar surface rotates more slowly than the stellar interior. We find that the way the magnetospheric current closes inside the star is linked to how the angular momentum is transferred inside the star. We obtain numerical solutions that shows that the magnetospheric current inside the star spreads over the polar cap magnetic flux embedded in the star in such a way that electromotive force is gained efficiently.

中文翻译:

论旋转动力脉冲星的角动量提取

旋转驱动的脉冲星以旋转功率除以角速度 Ω* 的速率损失角动量。这意味着由光子、相对论粒子和风提取的角动量的杠杆臂长度必须平均为 c/Ω*,这被称为光柱半径。因此,光柱内的任何旋转功率沉积都会导致角动量损失不足。在本文中,我们研究了这种能量释放的两种情况:极帽加速和恒星内部磁层电流中的欧姆加热。对于第一种情况,发现光柱外的外磁层可以补偿角动量损失的不足。我们认为,来自次旋转磁力线的能量通量必须大于立体角平均值,因此,在光变曲线的不同相位中观察到从光柱外发出的增强的能量通量那些在光筒内发射的。至于第二种情况,恒星表面比恒星内部旋转得更慢。我们发现,恒星内部磁层电流闭合的方式与恒星内部角动量的传递方式有关。我们获得的数值解表明,恒星内部的磁层电流以有效获得电动势的方式扩散到嵌入恒星的极帽磁通量上。在光曲线的不同相位中观察到从光柱外发出的增强的能量通量与光柱内发射的能量通量不同。至于第二种情况,恒星表面比恒星内部旋转得更慢。我们发现,恒星内部磁层电流闭合的方式与恒星内部角动量的传递方式有关。我们获得的数值解表明,恒星内部的磁层电流以有效获得电动势的方式扩散到嵌入恒星的极帽磁通量上。在光曲线的不同相位中观察到从光柱外发出的增强的能量通量与光柱内发射的能量通量不同。至于第二种情况,恒星表面比恒星内部旋转得更慢。我们发现,恒星内部磁层电流闭合的方式与恒星内部角动量的传递方式有关。我们获得的数值解表明,恒星内部的磁层电流以有效获得电动势的方式扩散到嵌入恒星的极帽磁通量上。我们发现,恒星内部磁层电流闭合的方式与恒星内部角动量的传递方式有关。我们获得的数值解表明,恒星内部的磁层电流以有效获得电动势的方式扩散到嵌入恒星的极帽磁通量上。我们发现,恒星内部磁层电流闭合的方式与恒星内部角动量的传递方式有关。我们获得的数值解表明,恒星内部的磁层电流以有效获得电动势的方式扩散到嵌入恒星的极帽磁通量上。
更新日期:2021-07-30
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