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arXiv 2004.08229astro-ph.HE
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几种异常类型脉冲星参数的比较

Comparison of pulsar parameters for some anomalous types

I. F. Malov, H. P. Marozava

摘要:

对两个射电望远镜样品进行了参数对比分析。第一个样本的物体具有周期P > 2秒,第二个样本的特征在于中子星表面$Bs > 4.4\times10^{13}$ G处的磁场。分析的主要目的是找出周期和磁场值相似的正常γ射线与异常γ射线和软γ射线重复源之间的差异。结果表明,对于长周期脉冲星,周期导数对周期的依赖关系为$dP/dt \propto P^{1.67}$。这意味着我们必须寻找另一种不同于磁偶极子的制动机制,它给出了$dP/dt \propto P^{-1}$或使用某些特定的参数分布。另一方面,具有强磁场和AXP/SGR的射电望远镜可以用磁偶极子模型来描述。P > 2秒的射电天体的平均年龄比具有$Bs > 4.4 \times 10^{13}$ G的天体高出两个数量级,并且位于银河平面上方更高的位置。结果表明,AXP/SGR的主要特征是强磁场,而不是大周期。

英文摘要:

The comparative analysis of parameters is carried out for two samples of radio pulsars. Objects of the first sample have periods P > 2 sec, the second is characterized by magnetic fields at the neutron star surface $Bs > 4.4\times10^{13}$ G. The main goal of this analysis is to find some differences between normal pulsars and anomalous X-ray pulsars (AXP) and soft gamma-ray repeaters (SGR) with the similar values of periods and magnetic fields. It is shown that the dependence of period derivatives on periods for pulsars with long periods is $dP/dt \propto P^{1.67}$. This means that we must search for another braking mechanism differing from the magnetic dipole one which gives $dP/dt \propto P^{-1}$ or use some specific distributions of parameters. On the other hand, radio pulsars with strong magnetic fields and AXP/SGR can be described by the magnetic dipole model. Radio pulsars with P > 2 sec have ages on average two orders of magnitude higher than objects with $Bs > 4.4 \times 10^{13}$ G and are located much higher above the Galactic plane. The obtained results show that the main feature of AXP/SGR is the strong magnetic field and not the large period.

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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