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arXiv 0901.1055astro-ph.SR
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由单个和双星中子星祖先的脉冲星自旋速度校准

Pulsar spin-velocity alignment from single and binary neutron star progenitors

A. G. Kuranov, S. B. Popov, K. A. Postnov

摘要:

本文研究了中子星的双星祖先在年轻中子星的视空间速度分布和自旋速度排列中所起的作用。用Monte-Carlo方法对NS出生反冲模型(方向分布、振幅和双星祖先的反冲减少)进行了不同假设条件下的单星和双星脉冲星星群的合成,其中双星祖先在主序带上经历了初始质量为8-11 $M_\odot$的罗氏瓣溢出引起的质量交换。计算出的自旋速度排列分布进行比较,从无线电极化测量获得的观测数据。观测到的双星的空间速度被发现主要是由出生踢速度的形式和它的振幅形成的;双星的分数在这里是不重要的合理的大踢。在NS形成过程中,反冲方向相对于自旋轴的分布被发现强烈地影响着自旋-速度相关性。与观测到的脉冲星自旋速度角比较,有利于一个相当大的比例的二元祖细胞和踢自旋角$\sim 5-20^\circ$。初始二元质量比分布的形式不影响我们的结果。

英文摘要:

The role of binary progenitors of neutron stars in the apparent distribution of space velocities and spin-velocity alignment observed in young pulsars is studied. A Monte-Carlo synthesis of pulsar population from single and binary stars with different assumptions about the NS natal kick model (direction distribution, amplitude, and kick reduction in binary progenitors which experienced mass exchange due to Roche lobe overflow with initial masses on the main sequence from the range 8-11 $M_\odot$) is performed. The calculated spin-velocity alignment distributions are compared with observational data obtained from radio polarization measurements. The observed space velocity of pulsars is found to be mostly shaped by the natal kick velocity form and its amplitude; the fraction of binaries is not important here for reasonably large kicks. The distribution of kick direction relative to the spin axis during the formation of a NS is found to affect strongly the spin-velocity correlation of pulsars. Comparison with observed pulsar spin-velocity angles favours a sizeable fraction of binary progenitors and the kick-spin angle $\sim 5-20^\circ$. The form of the initial binary mass ratio distribution does not affect our results.

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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