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arXiv 1607.07487astro-ph.HE
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高制动指数脉冲星PSR J1640-4631:具有大倾角的低质量中子星?

High braking index pulsar PSR J1640-4631: low-mass neutron star with a large inclination angle?

Wen-Cong Chen

摘要:

最近的时间观测限制了X射线脉冲星PSR J 1640 -4631的制动指数为$n=3.15\pm0.03$,这是迄今为止所有测量到制动指数的X射线脉冲星中最高的值。在这封信中,我们调查是否脉冲星制动之间的磁偶极辐射和引力辐射的组合可能有一个制动指数大于3。对于常规中子星和低质量夸克星候选者,由观测到的制动指数推导出的椭圆率明显大于理论估计的最大值。如果PSR J 1640 -4631是一颗质量为$0.1~ \rm M_{\odot}$的低质量中子星,那么推断的椭圆率可以近似等于理论估计的最大值。由于这个源的无线电安静的性质,我们采用真空间隙模型开发的Ruderman和萨瑟兰限制的倾斜角为$87.2-90^{\circ}$。在此基础上,我们提出一个小质量的大倾角中子星可以解释这个源的高制动指数和无线电宁静的性质。未来的观测,如引力波探测和长期的时间,这个来源是需要确认或反驳我们的情况。

英文摘要:

Recent timing observation constrained the braking index of the X-ray pulsar PSR J1640-4631 to be $n=3.15\pm0.03$, which is the highest value of all pulsars with measured braking indices so far. In this Letter, we investigate whether pulsar braking by combined between the magnetic dipole emission and the gravitational radiation might have a braking index greater than three. For conventional neutron star and low mass quark star candidates, the inferred ellipticities derived by the observed braking index are obviously much larger than the theoretical estimated maximum value. If PSR J1640-4631 is a low-mass neutron star with a mass of $0.1~ \rm M_{\odot}$, the inferred ellipticity can be approximately equal to the theoretical estimated maximum value. Because of the radio-quiet nature of this source, we employ the vacuum gap model developed by Ruderman and Sutherland to constrain the inclination angle to be $87.2-90^{\circ}$. Based on this, we propose that a low-mass neutron star with a large inclination angle can interpret the high braking index and the radio-quiet nature of this source. Future observations such as gravitational wave detection and long-term timing for this source are required to confirm or confute our scenario.

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