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arXiv 2102.06138astro-ph.HEastro-ph.SRphysics.plasm-ph
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发光X射线双星的周期性快速射电暴

Periodic Fast Radio Bursts from Luminous X-ray Binaries

Navin Sridhar, Brian D. Metzger, Paz Beniamini, Ben Margalit, Mathieu Renzo, Lorenzo Sironi, Konstantinos Kovlakas

摘要:

快速射电暴(FRB)到达时间周期性的发现,对磁星研究提出了挑战。然而,假设FRB是由磁化冲击或相对论外流中的磁重联引起的模型并不特定于磁星发动机;相反,它们只需要将相对论能量脉冲注入到致密的磁化介质中。因此,出于这样的动机,我们概述了一个新的场景,其中FRB是由来自吸积黑洞或中子星的短暂相对论流出("耀斑“)提供动力,这些流出传播到预先存在的("静止”)喷流的空腔中。为了重现FRB的光度和速率,我们被迫考虑进行超爱丁顿质量转移的恒星质量紧凑型天体的二进制文件,类似于超铝X射线(ULX)源。事实上,FRB的宿主星系,以及它们在宿主星系内的空间偏移,与ULX表现出广泛的相似性。几天到几年的时间尺度上的周期性可以归因于岁差(例如,透镜Thirring)的极地吸积漏斗,沿其FRB发射的几何和相对论光束,扫过观察者的视线。通过吸积功率来解释最明亮的FRB可能需要一群经历不稳定(动态时间尺度)质量转移的双星系。这将导致一些重复的FRB的性质在数月至数年的时间尺度上发生长期演化,随后是类似于发光的红新星的瞬态光学/IR对应物,或者更明亮的吸积动力光学/X射线瞬态。我们鼓励对已知ULX源进行有针对性的FRB搜索。

英文摘要:

The discovery of periodicity in the arrival times of the fast radio bursts (FRBs) poses a challenge to the oft-studied magnetar scenarios. However, models that postulate that FRBs result from magnetized shocks or magnetic reconnection in a relativistic outflow are not specific to magnetar engines; instead, they require only the impulsive injection of relativistic energy into a dense magnetized medium. Motivated thus, we outline a new scenario in which FRBs are powered by short-lived relativistic outflows (``flares'') from accreting black holes or neutron stars, which propagate into the cavity of the pre-existing (``quiescent'') jet. In order to reproduce FRB luminosities and rates, we are driven to consider binaries of stellar-mass compact objects undergoing super-Eddington mass-transfer, similar to ultraluminous X-ray (ULX) sources. Indeed, the host galaxies of FRBs, and their spatial offsets within their hosts, show broad similarities with ULXs. Periodicity on timescales of days to years could be attributed to precession (e.g., Lens-Thirring) of the polar accretion funnel, along which the FRB emission is geometrically and relativistically beamed, which sweeps across the observer line of sight. Accounting for the most luminous FRBs via accretion power may require a population of binaries undergoing brief-lived phases of unstable (dynamical-timescale) mass-transfer. This will lead to secular evolution in the properties of some repeating FRBs on timescales of months to years, followed by a transient optical/IR counterpart akin to a luminous red nova, or a more luminous accretion-powered optical/X-ray transient. We encourage targeted FRB searches of known ULX sources.

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