论文标题
重复超小的X射线爆发并重复快速无线电爆发：可能的关联？
Repeating Ultraluminous X-ray Bursts and Repeating Fast Radio Bursts: A Possible Association?
论文作者
论文摘要
超小的X射线爆发（以下称ULXB）是超X射线耀斑，快速上升（$ \ sim $一分钟）和缓慢的衰变（每小时$ \ sim $），通常在外层状球形球形群中观察到。大多数ULXB是观察性的一次性爆发，而Irwin等人发现了NGC 5128中同一来源的五个耀斑。 （2016）。在这封信中，我们提出了一个具有超级伊德丁顿增生率的中子星（NS） - 白矮人（WD）二进制模型，以解释NGC 5128中ULXB源的重复行为。在偏心轨道的情况下，大传质发生在Periastron处，WD填充了其Roche Lobe。可以通过NS磁极周围的积聚柱产生超湿的X射线耀斑。另一方面，还发现了一些重复的快速无线电爆发（以下称为FRB）在外层状球状簇中发现。重复ULXB和重复的FRB分别是X射线和无线电带中最暴力的爆发。我们提出了重复的ULXB与重复的FRB之间的可能关联。通过对附近的外乳外球状簇的随访观察值，值得进一步研究这种关联。
Ultraluminous X-ray bursts (hereafter ULXBs) are ultraluminous X-ray flares with a fast rise ($\sim$ one minute) and a slow decay ($\sim$ an hour), which are commonly observed in extragalactic globular clusters. Most ULXBs are observational one-off bursts, whereas five flares from the same source in NGC 5128 were discovered by Irwin et al. (2016). In this Letter, we propose a neutron star (NS)-white dwarf (WD) binary model with super-Eddington accretion rates to explain the repeating behavior of the ULXB source in NGC 5128. With an eccentric orbit, the mass transfer occurs at the periastron where the WD fills its Roche lobe. The ultraluminous X-ray flares can be produced by the accretion column around the NS magnetic poles. On the other hand, some repeating fast radio bursts (hereafter FRBs) were also found in extragalactic globular clusters. Repeating ULXBs and repeating FRBs are the most violent bursts in the X-ray and radio bands, respectively. We propose a possible association between the repeating ULXBs and the repeating FRBs. Such an association is worth further investigation by follow-up observations on nearby extragalactic globular clusters.
