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arXiv 2003.08724astro-ph.HE
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2016年船帆座故障:中子星内部结构和动力学的关键

The 2016 Vela glitch: a key to neutron star internal structure and dynamics

Erbil Gügercinoğlu, M. Ali Alpar

摘要:

对2016年船帆座故障及其弛豫的高分辨率脉冲对脉冲观测提供了一个机会,以前所未有的细节探测中子星的内部结构和动力学。我们使用这个小故障的观察来推断超流特性的框架内的涡蠕动模型。12.6秒的毛刺上升时间限制对地壳超流体和观测到的地壳之间的角动量交换施加了严格的限制。与观测到的旋转速率的过度加速度相比,后毛刺平衡值,这区分地壳超流地壳晶格和核心超流地壳正常物质耦合的时间尺度。一个明显的下降,在地壳旋转速率之前的毛刺是一致的形成一个新的涡旋陷阱区,启动大规模的涡旋unpinning雪崩。地壳破裂地震形成的涡旋陷阱引起磁层的短暂变化。长期的故障后自旋下降速率演变揭示了参与故障的超流体层的惯性矩和重新耦合时间尺度,并导致对下一个故障的时间估计,该时间与2016年和2019年故障之间的时间间隔一致。我们的结果是一致的超流体中的有效中子和质子质量的理论估计。我们还限制的涡流线通量管钉扎能量为2兆电子伏每交叉。

英文摘要:

High resolution, pulse to pulse observation of the 2016 Vela glitch and its relaxation provided an opportunity to probe the neutron star internal structure and dynamics with unprecedented detail. We use the observations of this glitch to infer superfluid characteristics in the framework of the vortex creep model. The glitch rise time constraint of 12.6 seconds put stringent limits on the angular momentum exchange between the crustal superfluid and the observed crust. Together with the observed excess acceleration in the rotation rate as compared to the post-glitch equilibrium value this discriminates crustal superfluid-crust lattice and core superfluid-crustal normal matter coupling time-scales. An evident decrease in the crustal rotation rate immediately before the glitch is consistent with the formation of a new vortex trap zone that initiates the large scale vortex unpinning avalanche. Formation of vortex trap by a crust breaking quake induces short-lived magnetospheric changes. The long term post-glitch spin-down rate evolution reveals the moments of inertia and recoupling time-scales of the superfluid layers participating in the glitch and leads to an estimation of the time to the next glitch which agrees with the time interval between the 2016 and 2019 glitches. Our results are consistent with theoretical estimates of effective neutron and proton masses in the superfluid. We also constrain the vortex line-flux tube pinning energy per intersection as 2 MeV.

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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