Fast extragalactic x-ray transients from binary neutron star mergers

Dado, S.; Dar, Arnon

doi:10.1103/physrevd.101.063008

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…The AG of GRB 990510 and others which were fit by smoothly broken power laws are not conclusive evidence of conical jets. In fact, an isotropic radiation from a pulsar wind nebula (PWN), powered by a newly born millisecond pulsar, has an expected luminosity [117] satisfying…”

Section: Time After Grb (Days)mentioning

confidence: 99%

Critical Tests of Leading Gamma Ray Burst Theories

2022

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It has been observationally established that supernovae (SNe) of Type Ic produce long duration gamma-ray bursts (GRBs) and that neutron star mergers generate short hard GRBs. SN-Less GRBs presumably originate in a phase transition of a neutron star in a high mass X-ray binary. How these phenomena actually generate GRBs is debated. The fireball and cannonball models of GRBs and their afterglows have been widely confronted with the huge observational data, with their defenders claiming success. The claims, however, may reflect multiple choices and the use of many adjustable parameters, rather than the validity of the models. Only a confrontation of key falsifiable predictions of the models with solid observational data can test their validity. Such critical tests are reviewed in this report.

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Section: Time After Grb (Days)mentioning

confidence: 99%

Critical Tests of Leading Gamma Ray Burst Theories

2022

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“…Degree of collimation of X-ray emission in transients under study is uncertain. Recently, in [18] the authors provided arguments that early X-ray afterglows after NS-NS coalescence can be unbeamed. Emission is provided by a newborn rapidly spinning magnetar.…”

Section: Uncertaintiesmentioning

confidence: 99%

“…We studied the effect of uncertainty in the SFR applying an alternative value presented in a recent e-print [18]:…”

Section: Uncertaintiesmentioning

confidence: 99%

Detectability of neutron star — White dwarf coalescences by eROSITA and ART-XC

Khokhriakova

Попов

2019

Journal of High Energy Astrophysics

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Coalescences of neutron stars and white dwarfs are relatively frequent phenomena, outnumbering other types of compact object mergers (neutron stars and black holes without involving white dwarfs) altogether. Such event potentially can produce not only optical, but also an X-ray burst. Transient source CDF-S XT2 [1] can be an example of this type of events as suggested by [2]. In this note we estimate the rate of these transients in the field of view of X-ray instruments on-board Spectrum-RG satellite. We demonstrate that during four years of the survey program several thousand of events related to neutron star white dwarf mergers might appear in the field of view of eROSITA. Collimation of X-ray emission can reduce this number. Smaller, but comparable number of transients is expected in the case of ART-XC telescope. However, due to relatively short duration 10 4 s, mostly such transients might be visible just in one scan of telescopes (∼ 40 s), and so only a few photons are expected to be detected which makes definite identification without additional information very problematic.

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Investigating the off-axis GRB afterglow scenario for extragalactic fast X-ray transients

Wichern,

Ravasio,

Jonker

et al. 2024

A&A

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Extragalactic fast X-ray transients (FXTs) are short-duration (sim ks) X-ray flashes of unknown origin, potentially arising from binary neutron star (BNS) mergers, tidal disruption events, or supernova shock breakouts. In the context of the BNS scenario, we investigate the possible link between FXTs and the afterglows of off-axis merger-induced gamma-ray bursts (GRBs). By modelling well-sampled broadband afterglows of 13 merger-induced GRBs, we make predictions for their X-ray light curve behaviour had they been observed off-axis, considering both a uniform jet with core angle $ C $ and a Gaussian-structured jet whose edge lies at an angle $ W C $. We compare their peak X-ray luminosity, duration, and temporal indices alpha (where $F alpha $) with those of the currently known extragalactic FXTs. Our analysis reveals that a slightly off-axis observing angle of $ obs C $ and a structured jet are required to explain the shallow ($| 0.3) temporal indices of the FXT light curves, which cannot be reproduced in the uniform-jet case at any viewing angle. In the case of a structured jet with truncation angle $ W C $, the distributions of the duration of the FXTs are consistent with those of the off-axis afterglows for the same range of observing angles, $ obs C $. While the distributions of the off-axis peak X-ray luminosity are consistent only for $ obs C $, focussing on individual events with different intrinsic luminosities reveals that the match of all three properties (peak X-ray luminosity, duration and temporal indices) of the FXTs at the same viewing angle is possible in the range $ obs C $. Despite the small sample of GRBs analysed, these results show that there is a region of the parameter space -- although quite limited -- where the observational properties of off-axis GRB afterglow can be consistent with those of the newly discovered FXTs. Future observations of FXTs discovered by the recently launched Einstein Probe mission and GRB population studies combined with more complex afterglow models will shed light on this possible GRB-FXT connection, and eventually unveil the progenitors of some FXTs.

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Fast extragalactic x-ray transients from binary neutron star mergers

Cited by 5 publications

References 53 publications

Critical Tests of Leading Gamma Ray Burst Theories

Critical Tests of Leading Gamma Ray Burst Theories

Detectability of neutron star — White dwarf coalescences by eROSITA and ART-XC

Investigating the off-axis GRB afterglow scenario for extragalactic fast X-ray transients

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