On the radiation mechanism of repeating fast radio bursts

Lu, W.; Kumar, Pawan

doi:10.1093/mnras/sty716

Cited by 152 publications

(175 citation statements)

References 116 publications

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“…A number of radiation models have been suggested (e.g. Katz 2014; Romero et al 2016;Lu & Kumar 2018;Metzger et al 2019;Beloborodov 2019). Without observational constraints on the intrinsic emission mechanism of FRBs, sources in frbpoppy are assumed to be radiating isotropically.…”

Section: Luminositymentioning

confidence: 99%

Synthesising the intrinsic FRB population using frbpoppy

Gardenier

Leeuwen

Connor

et al. 2019

A&A

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Context. Fast Radio Bursts (FRBs) are radio transients of an unknown origin. Naturally, we are curious as to their nature. Enough FRBs have been detected for a statistical approach to parts of this challenge to be feasible. To understand the crucial link between detected FRBs and the underlying FRB source classes we perform FRB population synthesis, to determine how the underlying population behaves. The Python package we developed for this synthesis, frbpoppy, is open source and freely available. Aims. Our goal is to determine the current best fit FRB population model. Our secondary aim is to provide an easy-to-use tool for simulating and understanding FRB detections. It can compare surveys, or inform us of the intrinsic FRB population. Methods. frbpoppy simulates intrinsic FRB populations and the surveys that find them, to produce virtual observed populations. These resulting populations can then be compared with real data, allowing constrains to be placed on underlying physics and selection effects.Results. We are able to replicate real Parkes and ASKAP FRB surveys, in terms of both detection rates and distributions observed. We also show the effect of beam patterns on the observed dispersion measure (DM) distributions. We compare four types of source models. The "Complex" model, featuring a range of luminosities, pulse widths and spectral indices, reproduces current detections best. Conclusions. Using frbpoppy, an open-source FRB population synthesis package, we explain current FRB detections and offer a first glimpse of what the true population must be.

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Section: Luminositymentioning

confidence: 99%

Synthesising the intrinsic FRB population using frbpoppy

Gardenier

Leeuwen

Connor

et al. 2019

A&A

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“…through the curvature emission mechanism (e.g. Cordes & Wasserman 2016;Kumar et al 2017;Katz 2018b;Lu & Kumar 2018;Lyutikov 2019).…”

Section: Introductionmentioning

confidence: 99%

Constraints on the engines of fast radio bursts

Margalit

Metzger

Sironi

2020

Monthly Notices of the Royal Astronomical Society

112

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We model the sample of fast radio bursts (FRB), including the newly discovered CHIME repeaters, using the decelerating synchrotron blast wave model of Metzger, Margalit & Sironi (2019), which built on earlier work by Lyubarsky (2014), Beloborodov (2017). This model postulates that FRBs are precursor radiation from ultra-relativistic magnetized shocks generated as flare ejecta from a central engine collides with an effectively stationary external medium. Downward drifting of the burst frequency structure naturally arises from the deceleration of the blast-wave coupled with the dependence of the maser spectral energy distribution, and induced Compton scattering depth, on the upstream medium. The data are consistent with FRBs being produced by flares of energy E flare ∼ 10 43 − 10 46 ( f ξ /10 −3 ) −4/5 erg, where f ξ is the maser efficiency, and minimum bulk Lorentz factors Γ ≈ 10 2 − 10 3 , which generate the observed FRBs at shock radii r sh ∼ 10 12 − 10 13 cm. We infer upstream densities n ext (r sh ) ∼ 10 2 − 10 4 cm −3 and radial profiles n ext ∝ r −k showing a range of slopes k ≈ [−2, 1] (which are seen to evolve between bursts), both broadly consistent with the upstream medium being the inner edge of an ion-loaded shell released by a recent energetic flare. The burst timescales, energetics, rates, and external medium properties are consistent with repeating FRBs arising from young, hyper-active flaring magnetars, but the methodology presented is generally applicable to any central engine which injects energy impulsively into a dense magnetized medium. Several uncertainties and variations of the model regarding the composition and magnetization of the upstream medium, and the effects of the strong electric field of the FRB wave (strength parameter a 1) on the upstream medium and its scattering properties, are discussed. One-dimensional particle-in-cell simulations of magnetized shocks into a pair plasma are presented which demonstrate that high maser efficiency can be preserved, even in the limit a 1 in which the FRB wave accelerates the upstream electrons to ultra-relativistic speeds.

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“…Some of the remnants may form magnetars as we analyzed. From the newborn magnetar, repeating FRBs can be created by the coherent curvature radiation of the electrons [46][47] energized through the magnetic reconnections by the crustal movement where the magnetic fields are anchored [24], or starquakes [25]. The crust of very young magnetar is unstable due to the differential rotation, significant magnetic decay and spin-down of the magnetar.…”

Section: Discussion On Emission and Formation Rate Of Remnantsmentioning

confidence: 99%

“…The repeating pulses of FRB 121102 show complex frequency and time structure [23]. A variety of models have been proposed for the repeating FRBs [24][25], some of which involve magnetars. There are 29 magnetars observed in the Milky Way and The Magellanic Clouds (See the McGill magnetar catalog 1 [26]), though none of them shows high luminosity pulses as observed in FRB 121102, probably because of FRBs only present at the very early age of magnetars.…”

Section: Introductionmentioning

confidence: 99%

The Remnant of Neutron Star-White Dwarf Merger and the Repeating Fast Radio Bursts

Ling¹

2020

IJAA

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Fast radio bursts (FRBs) at cosmological distances still hold concealed physical origins. Previously Liu (2018) proposes a scenario that the collision between a neutron star (NS) and a white dwarf (WD) can be one of the progenitors of non-repeating FRBs and notices that the repeating FRBs can also be explained if a magnetar formed after such NS-WD merger. In this paper, we investigate this channel of magnetar formation in more detail. We propose that the NS-WD post-merger, after cooling and angular momentum redistribution, may collapse to either a black hole or a new NS or even remains as a hybrid WDNS, depending on the total mass of the NS and WD. In particular, the newly formed NS can be a magnetar if the core of the WD collapsed into the NS while large quantities of degenerate electrons of the WD compressed to the outer layers of the new NS. A strong magnetic field can be formed by the electrons and positive charges with different angular velocities induced by the differential rotation of the newborn magnetar. Such a magnetar can power the repeating FRBs by the magnetic reconnections due to the crustal movements or starquakes.

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On the radiation mechanism of repeating fast radio bursts

Cited by 152 publications

References 116 publications

Synthesising the intrinsic FRB population using frbpoppy

Synthesising the intrinsic FRB population using frbpoppy

Constraints on the engines of fast radio bursts

The Remnant of Neutron Star-White Dwarf Merger and the Repeating Fast Radio Bursts

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