A comparative study of host galaxy properties between Fast Radio Bursts and stellar transients

Li, Ye; Zhang, Bing

doi:10.48550/arxiv.2005.02371

Cited by 2 publications

(4 citation statements)

References 70 publications

(109 reference statements)

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“…These magnetars may store less toroidal magnetic energy inside the star and are relatively less active compared with their active cousins. The possible dichotomy of FRB magnetar progenitor is consistent with the host galaxy data of the localized FRBs (Li & Zhang 2020): whereas FRB 121102 has a host galaxy similar to that of LGRBs or SLSNe (Tendulkar et al 2017;Metzger et al 2017;Nicholl et al 2017), other four hosts resemble the Milky Way galaxy that hosts regular magnetars (Bannister et al 2019;Ravi et al 2019;Prochaska et al 2019;Marcote et al 2020).…”

Section: Nature Of Frb Progenitorssupporting

confidence: 76%

“…Each pulse has duration of about 1 ms, after correcting for scattering broadening. We also note that the associated X-ray burst also had two distinct peaks separated by 30 ms in the hardest band (27-250 keV) of HXMT (Li et al 2020), which were temporally coincident with the two radio peaks. This suggests that the two radio pulses are generated by two separated ejectas.…”

Section: Appendix A: "Far-away" Models -Emission From Beyond the Ligh...mentioning

confidence: 54%

“…A hard X-ray burst was detected from SGR 1935+2154 by several instruments including INTEGRAL (Mereghetti et al 2020), Insight-HXMT (Li et al 2020), AGILE (Tavani et al 2020), Konus-Wind (Ridnaia et al 2020), and the arrival time is in agreement with that of the FRB after dedispersion. The X-ray burst had fluence of 7×10 −7 erg cm −2 in the 1-150 keV range, and the lightcurve in the hardest band (27-250 keV) of HXMT showed two distinct peaks sep-arated by about 30 ms (Li et al 2020), further confirming the association with the FRB 200428. The isotropic energy (νEν ) ratio between the radio and the hard X-ray bands is ∼ 3 × 10 −5 .…”

Section: Introductionmentioning

confidence: 91%

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A unified picture of Galactic and cosmological fast radio bursts

Kumar

Zhang³

2020

Preprint

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The discovery of a fast radio burst (FRB) in our galaxy associated with a magnetar (neutron star with strong magnetic field) has provided a critical piece of information to help us finally understand these enigmatic transients. We show that the volumetric rate of Galactic-FRB like events is consistent with the faint end of the cosmological FRB rate, and hence they most likely belong to the same class of transients. The Galactic FRB had an accompanying X-ray burst but many X-ray bursts from the same object had no radio counterpart. Their relative rates suggest that for every FRB there are roughly 10 2 -10 3 X-ray bursts. The radio lightcurve of the galactic FRB had two spikes separated by 30 ms in the 400-800 MHz frequency band. This is an important clue and highly constraining of the class of models where the radio emission is produced outside the light-cylinder of the magnetar. We suggest that magnetic disturbances close to the magnetar surface propagate to a distance of a few tens of neutron star radii where they damp and produce radio emission. The coincident hard X-ray spikes associated with the two FRB pulses seen in this burst and the flux ratio between the two frequency bands can be understood in this scenario. This model provides a unified picture for faint bursts like the Galactic FRB as well as the bright events seen at cosmological distances.

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Section: Nature Of Frb Progenitorssupporting

confidence: 76%

Section: Appendix A: "Far-away" Models -Emission From Beyond the Ligh...mentioning

confidence: 54%

Section: Introductionmentioning

confidence: 91%

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A unified picture of Galactic and cosmological fast radio bursts

Kumar

Zhang³

2020

Preprint

Self Cite

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“…Attempts to perform an analysis along these lines are already underway (e.g. Margalit et al 2019;Li & Zhang 2020), though it should be cautioned that without at least arcsecond localization, it is usually challenging to uniquely identify the host galaxy (Eftekhari et al 2018), much less the local environment within the host galaxy as becomes available with VLBI localization (Bassa et al 2017;Marcote et al 2020).…”

Section: Two-component Populationmentioning

confidence: 99%

Implications of a "Fast Radio Burst" from a Galactic Magnetar

Margalit,

Beniamini,

Sridhar

et al. 2020

Preprint

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A luminous radio burst was recently detected in temporal coincidence with a hard X-ray flare from the Galactic magnetar SGR 1935+2154 with a time and frequency structure consistent with cosmological fast radio bursts (FRB) and a fluence within a factor of 10 of the least energetic extragalactic FRB previously detected. Although active magnetars are commonly invoked FRB sources, several distinct mechanisms have been proposed for generating the radio emission which make different predictions for the accompanying higher frequency radiation. We show that the properties of the coincident radio and X-ray flares from SGR 1935+2154, including their approximate simultaneity and relative fluence E radio /E X ∼ 10 −5 , as well as the duration and spectrum of the X-ray emission, are consistent with extant predictions for the synchrotron maser shock model. Rather than arising from the inner magnetosphere, the X-rays are generated by (incoherent) synchrotron radiation from thermal electrons heated at the same internal shocks which produce the coherent maser emission as ultra-relativistic flare ejecta collides with a slower particle outflow (e.g. as generated by earlier flaring activity) on a radial scale ∼ 10 11 cm. Although the rate of SGR 1935+2154-like bursts in the local universe is not sufficient to contribute appreciably to the extragalactic FRB rate, the inclusion of an additional population of more active magnetars with stronger magnetic fields than the Galactic population can explain both the FRB rate as well as the repeating fraction, however only if the population of active magnetars are born at a rate that is at least two-orders of magnitude lower than that of SGR 1935+2154-like magnetars. This may imply that the more active magnetar sources are not younger magnetars formed in a similar way to the Milky Way population (e.g. via ordinary supernovae), but instead through more exotic channels such as superluminous supernovae, accretion-induced collapse or neutron star mergers.

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A comparative study of host galaxy properties between Fast Radio Bursts and stellar transients

Cited by 2 publications

References 70 publications

A unified picture of Galactic and cosmological fast radio bursts

A unified picture of Galactic and cosmological fast radio bursts

Implications of a "Fast Radio Burst" from a Galactic Magnetar

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