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arXiv 1707.01396astro-ph.HE
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磁畸变引起的中子星的椭圆率和引力波辐射:短伽玛暴中的毫秒磁星、银河系磁星和磁星

Magnetic-distortion-induced ellipticity and gravitational wave radiation of neutron stars: millisecond magnetars in short GRBs, Galactic pulsars, and magnetars

He Gao, Zhoujian Cao, Bing Zhang

摘要:

中子星由于磁畸变而可能产生非轴对称形变,是地基干涉测量探测器的连续引力波(GW)源。经过几十年的搜索,使用现有的GW探测器,没有证据表明GW信号来自任何脉冲星。椭圆率的上限越来越严格地限制在银河系的恒星上。在这项工作中,我们使用的椭圆率推断从假定的毫秒磁星在短伽马射线暴(SGRB),以估计其可探测性目前和未来的GW探测器。对于从SGRB数据推断的$\sim 1$ ms磁星,高级LIGO(aLIGO)和爱因斯坦望远镜(ET)的探测视界分别为$\sim 30$ Mpc和$\sim 600$ Mpc。利用SGRB毫秒磁星的椭圆率作为刻度,在假设椭圆率是磁畸变引起的情况下,我们估算了银河系中的毫秒磁星和磁星的椭圆率和引力波应变。我们发现,该结果与aLIGO O 1对银河系恒星和磁星的零探测结果是一致的。我们进一步预测,GW信号从这些恒星/磁星可能无法检测到目前设计的aLIGO探测器。ET检测器可能能够检测来自这些天线中的一些天线的一些相对低频的信号($<50$ Hz)。受其设计灵敏度的限制,eLISA探测器似乎不适合探测来自银河系恒星和磁星的信号。

英文摘要:

Neutron stars may sustain a non-axisymmetric deformation due to magnetic distortion and are potential sources of continuous gravitational waves (GWs) for ground-based interferometric detectors. With decades of searches using available GW detectors, no evidence of a GW signal from any pulsar has been observed. Progressively stringent upper limits of ellipticity have been placed on Galactic pulsars. In this work, we use the ellipticity inferred from the putative millisecond magnetars in short gamma-ray bursts (SGRBs) to estimate their detectability by current and future GW detectors. For $\sim 1$ ms magnetars inferred from the SGRB data, the detection horizon is $\sim 30$ Mpc and $\sim 600$ Mpc for advanced LIGO (aLIGO) and Einstein Telescope (ET), respectively. Using the ellipticity of SGRB millisecond magnetars as calibration, we estimate the ellipticity and gravitational wave strain of Galactic pulsars and magnetars assuming that the ellipticity is magnetic-distortion-induced. We find that the results are consistent with the null detection results of Galactic pulsars and magnetars with the aLIGO O1. We further predict that the GW signals from these pulsars/magnetars may not be detectable by the currently designed aLIGO detector. The ET detector may be able to detect some relatively low frequency signals ($<50$ Hz) from some of these pulsars. Limited by its design sensitivity, the eLISA detector seems not suitable for detecting the signals from Galactic pulsars and magnetars.

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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