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Glitch Rises as a Test for Rapid Superfluid Coupling in Neutron Stars

机译:小故障上升作为中子星中快速超流体耦合的测试

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Pulsar glitches provide a unique way to study neutron star microphysics because short post-glitch dynamics are directly linked to strong frictional processes on small scales. To illustrate this connection between macroscopic observables and microphysics, we review calculations of vortex interactions focusing on Kelvin wave excitations and determine the corresponding mutual friction strength for realistic microscopic parameters in the inner crust. These density-dependent crustal coupling profiles are combined with a simplified treatment of the core coupling and implemented in a three-component neutron star model to construct a predictive framework for glitch rises. As a result of the density-dependent dynamics, we find the superfluid to transfer angular momentum to different parts of the crust and the core on different timescales. This can cause the spin frequency change to become non-monotonic in time, allowing for a maximum value much larger than the measured glitch size, as well as a delay in the recovery. The exact shape of the calculated glitch rise is strongly dependent on the relative strength between the crust and core mutual friction, providing the means to probe not only the crustal superfluid but also the deeper neutron star interior. To demonstrate the potential of this approach, we compare our predictive model with the first pulse-to-pulse observations recorded during the 2016 December glitch of the Vela pulsar. Our analysis suggests that the glitch rise behavior is relatively insensitive to the crustal mutual friction strength as long as ??10?3, while being strongly dependent on the core coupling strength, which we find to be in the range .
机译:脉冲星毛刺提供了一种研究中子星微物理学的独特方法,因为短毛刺后的短动态与小规模的强摩擦过程直接相关。为了说明宏观可观察物与微观物理学之间的这种联系,我们回顾了以开尔文波激发为重点的涡旋相互作用的计算,并确定了内部地壳中实际微观参数的相应相互摩擦强度。这些依赖于密度的地壳耦合剖面与对岩心耦合的简化处理相结合,并在三组分中子星模型中实施,以构建预测毛刺上升的框架。作为依赖于密度的动力学的结果,我们发现了超流体,可以在不同的时间尺度上将角动量传递到地壳和岩心的不同部分。这可能会导致自旋频率变化在时间上变得非单调,从而允许最大值远大于测得的毛刺大小,并导致恢复延迟。计算得出的毛刺上升的确切形状在很大程度上取决于地壳与堆芯相互摩擦之间的相对强度,不仅提供了探测地壳超流体的手段,而且还提供了探测更深的中子星内部的手段。为了证明这种方法的潜力,我们将我们的预测模型与2016年12月在Vela脉冲星的小故障期间记录的第一批脉冲到脉冲观测值进行了比较。我们的分析表明,毛刺上升行为对地壳的相互摩擦强度相对不敏感,只要Δε10?3,而在很大程度上取决于岩心的耦合强度,我们发现该范围在此范围内。

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