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arXiv 2108.00350astro-ph.HEastro-ph.SR
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Be/X射线双星重复快速射电暴的周期活动

Periodic Activities of Repeating Fast Radio Bursts from Be/X-ray Binary Systems

Qiao-Chu Li, Yuan-Pei Yang, F. Y. Wang, Kun Xu, Yong Shao, Ze-Nan Liu, Z. G. Dai

摘要:

最近观测到了快速射电暴FRB 180916.J0158+65(FRB 180916 B)的频率相关周期活动窗。在这封信中,我们提出由一颗中子星(NS)和一颗Be星组成的Be/X射线双星(BeXRB)系统可能是具有周期活动的重复FRB的源,并应用该模型解释了FRB 180916 B的活动窗口。南北磁层与吸积物质的相互作用导致南北磁层的自转周期和离心力的演化,从而导致南北地壳应力的变化。当地壳应力达到临界值时,发生星震并进一步产生FRB。星震之间的间隔估计为几天,小于FRB 180916 B的活动窗口。当NS移出Be星的盘面时,星震之间的间隔变得比轨道周期长得多,这对应于非活动阶段。在这个模型中,由于Be星盘的吸收,FRB将出现一个依赖于频率的活动窗口,这与FRB 180916 B的观测特性一致。而Be星盘的色散测度(DM)的贡献很小。此外,FRB 180916 B在宿主星系中的位置与BeXRB系统一致。

英文摘要:

The frequency-dependent periodic active window of the fast radio burst FRB 180916.J0158+65 (FRB 180916B) was observed recently. In this Letter, we propose that a Be/X-ray binary (BeXRB) system, which is composed of a neutron star (NS) and a Be star with a circumstellar disk, might be the source of a repeating FRB with periodic activities, and apply this model to explain the activity window of FRB 180916B. The interaction between the NS magnetosphere and the accreted material results in evolution of the spin period and the centrifugal force of the NS, leading to the change of the stress in the NS crust. When the stress of the crust reaches the critical value, a starquake occurs and further produces FRBs. The interval between starquakes is estimated to be a few days that is smaller than the active window of FRB 180916B. When the NS moves out of the disk of the Be star, the interval between starquakes becomes much longer than the orbital period, which corresponds to the non-active phase. In this model, due to the absorption of the disk of the Be star, a frequency-dependent active window would appear for the FRBs, which is consistent with the observed properties of FRB 180916B. And the contribution of dispersion measure (DM) from the disk of the Be star is small. In addition, the location of FRB 180916B in the host galaxy is consistent with a BeXRB system.

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