Rapid spin changes around a magnetar fast radio burst

Hu, Chin-Ping; Narita, Takuto; Enoto, Teruaki; Younes, George; Wadiasingh, Zorawar; Baring, Matthew G.; Ho, Wynn C. G.; Guillot, Sebastien; Ray, Paul S.; Güver, Tolga; Rajwade, Kaustubh; Arzoumanian, Zaven; Kouveliotou, Chryssa; Harding, Alice K.; Gendreau, Keith C.

doi:10.1038/s41586-023-07012-5

Cited by 7 publications

(1 citation statement)

References 46 publications

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“…Such kind of a glitches have been discovered in accretion-powered pulsars by Serim et al (2017) and Galloway et al (2004) with a sudden frequency change of Δv = 1.28(5) × 10 −6 Hz and Δv = 1.8 × 10 −6 Hz. These glitches are similar to the giant glitches of SGR J1935+2154 occurring before FRB-like bursts (Ge et al 2024;Hu et al 2024). Such glitches could alter the core magnetic field during the relaxation phase of the glitch, which will eventually trigger the movement of the crust and produce FRBs through the crust quakes (Wang et al 2018;Suvorov & Kokkotas 2019).…”

Section: A Self-consistent Model For Frb 20180916bmentioning

confidence: 65%

The Physical Origin of the Periodic Activity for FRB 20180916B

Lan,

Zhao,

Wei

et al. 2024

ApJL

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Fast radio bursts (FRBs) are transient radio signals with millisecond-duration, large dispersion measure and extremely high brightness temperature. Among them, FRB 20180916B has been found to have a 16 days periodically modulated activity. However, the physical origin of the periodicity is still a mystery. Here, we utilize the comprehensive observational data to diagnose the periodic models. We find that the ultralong rotation model is the most probable one for the periodic activity. However, this model cannot reproduce the observed rotation measure (RM) variations. We propose a self-consistent model, i.e., a massive star binary containing a slowly rotational neutron star and a massive star with large mass loss, which can naturally accommodate the wealth of observational features for FRB 20180916B. In this model, the RM variation is periodic, which can be tested by future observations.

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Section: A Self-consistent Model For Frb 20180916bmentioning

confidence: 65%

The Physical Origin of the Periodic Activity for FRB 20180916B

Lan,

Zhao,

Wei

et al. 2024

ApJL

View full text Add to dashboard Cite

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Beyond the Rotational Deathline: Radio Emission from Ultra-long Period Magnetars

Cooper,

Wadiasingh

2024

Monthly Notices of the Royal Astronomical Society

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Motivated by the recent detection of ultra-long period radio transients, we investigate new models of coherent radio emission via low-altitude electron-positron pair production in neutron stars beyond rotationally-powered curvature radiation deathlines. We find that plastic motion (akin to ‘continental drift’) and qualitatively similar thermoelectric action by temperature gradients in the crusts of slowly rotating, highly magnetized neutron stars could impart mild local magnetospheric twists. Regardless of which mechanism drives twists, we find that particle acceleration initiates pair cascades across charge-starved gaps above a mild critical twist. Cascades are initiated via resonant inverse-Compton scattered photons or curvature radiation, and may produce broadband coherent radio emission. We compute the pair luminosity (maximum allowed radio luminosity) for these two channels, and derive deathlines and ‘active zones’ in $P-\dot{P}$ space from a variety of considerations. We find these twist-initiated pair cascades only occur for magnetar-like field strengths B ≳ 1014 G and long periods: PRICS ≳ 120 (T/106.5K)−5 sec and $P_{\rm curv} \gtrsim 150 \,\, ({\rm v_{\rm pl}}/10^{3} {\, \rm cm \, yr^{-1}})^{-7/6} \, {\rm sec}$. Using a simplified geometric model, we find that plastic motion or thermoelectrically driven twists might naturally reproduce the observed luminosities, timescales, and timing signatures. We further derive ‘active zones’ in which rotationally-powered pair creation occurs via resonantly scattered photons, beyond standard curvature deathlines for pulsars. All cascades are generically accompanied by simultaneous (non-)thermal X-ray/UV counterparts which might be detectable with current instrumentation.

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An alternative interpretation of magnetars’ traits deduced from the observational data on their outburst fluxes and spectra

Ardavan

2024

Monthly Notices of the Royal Astronomical Society

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By applying the Efron-Petrosian method to the fluxes S and distances D of the magnetars listed in the Magnetar Outburst Online Catalogue, we show that the observational data are consistent with the dependence S∝D−3/2, which characterizes the emission from the superluminally moving current sheet in the magnetosphere of a non-aligned neutron star, at substantially higher levels of significance than they are with the dependence S∝D−2. This result agrees with that previously obtained by an analysis of the data in the McGill Online Magnetar Catalog and confirms that, contrary to the currently prevalent view, magnetars’ X-ray luminosities do not exceed their spin-down luminosities. The X-ray spectra of magnetars, moreover, are congruous with the spectral energy distribution (SED) of a broadband non-thermal emission mechanism identical to that at play in rotation-powered pulsars: we show that the SED of the caustics that are generated in certain privileged directions by the magnetospheric current sheet single-handedly fits the observed spectra of 4U 0142+61, 1E 1841-045 and XTE J1810-197 over their entire breadths. Magnetars’ outbursts and their associated radio bursts are predicted to occur when, as a result of large-scale timing anomalies (such as glitches, quakes or precession), one of the privileged directions along which the radiation from the current sheet decays more slowly than predicted by the inverse-square law either swings past or oscillates across the line of sight.

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Rapid spin changes around a magnetar fast radio burst

Cited by 7 publications

References 46 publications

The Physical Origin of the Periodic Activity for FRB 20180916B

The Physical Origin of the Periodic Activity for FRB 20180916B

Beyond the Rotational Deathline: Radio Emission from Ultra-long Period Magnetars

An alternative interpretation of magnetars’ traits deduced from the observational data on their outburst fluxes and spectra

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