A burst storm from the repeating FRB 20200120E in an M81 globular cluster

Nimmo, K.; Hessels, J. W. T.; Snelders, M. P.; Karuppusamy, R.; Hewitt, D. M.; Kirsten, F.; Marcote, B.; Bach, U.; Bansod, A.; Barr, E. D.; Behrend, J.; Bezrukovs, V.; Buttaccio, S.; Feiler, R.; Gawroński, M.; Lindqvist, M.; Orbidans, A.; W., Puchalska,; N., Wang,; Winchen, T.; Wolak, P.; Wu, J.; Yuan, J.

doi:10.48550/arxiv.2206.03759

Cited by 3 publications

(8 citation statements)

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“…For a telescope operating at fluence completeness threshold F ν,th , the telescope is sensitive to bursts above the energy threshold E th = 4π 2 D 2 νF ν,th . In this case, the detectable burst rate at a given distance is determined by the assumed burst energy distribution, which is expected to take the form µ a dN dE E with the uncertain power-law index α potentially varying from roughly −1 to −4.5 (e.g., Luo et al 2018;Lu & Piro 2019;Hashimoto et al 2020;Cruces et al 2021;Lanman et al 2022;Nimmo et al 2022b). The number of bursts above E th at some distance D then takes the form µ…”

Section: Estimating Local Frb Source Counts and Ratesmentioning

confidence: 99%

“…In principle, Equation (1) should also contain a frequency dependence, however since different repeaters may very well exhibit different frequency dependencies, we simply neglect this dependence here. Recently, Nimmo et al (2022b) reported 60 bursts detected with the Effelsberg telescope (F ν,th = 0.16 Jy ms) for an observing duration of roughly 28 hr. As a sanity check, Equation (1) implies a detectable burst rate of roughly 2-8 hr −1 for F ν,th = 0.16 Jy ms and α ä (−2, −2.4), consistent to within a small factor of the detected burst rate from Nimmo et al (2022b).…”

Section: Estimating Local Frb Source Counts and Ratesmentioning

confidence: 99%

“…recently via an accretion-induced collapse (AIC; e.g., Tauris et al 2013) or via a massive white dwarf binary merger (e.g., Kremer et al 2021b) may provide a natural formation mechanism for this repeater. Recently, Nimmo et al (2022b) presented detections of a "burst storm" from the M81 repeater providing constraints on the burst energy distribution and waittime distribution of the source. Additionally, studies have shown this source uniquely exhibits extremely narrow features (Majid et al 2021;Nimmo et al 2022a).…”

Section: Introductionmentioning

confidence: 99%

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Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies

Kremer

et al. 2023

ApJ

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The recent detection of a repeating fast radio burst (FRB) in an old globular cluster in M81 challenges traditional FRB formation mechanisms based on the magnetic activity of young neutron stars formed in core-collapse supernovae. Furthermore, the detection of this repeater in such a nearby galaxy implies a high local universe rate of similar events in globular clusters. Building off the properties inferred from the M81 FRB, we predict the number of FRB sources in nearby (d ≲ 20 Mpc) galaxies with large globular cluster systems known. Incorporating the uncertain burst energy distribution, we estimate the rate of bursts detectable in these galaxies by radio instruments such as FAST and MeerKat. Of all local galaxies, we find M87 is the best candidate for FRB detections. We predict that M87's globular cluster system contains  ( 10 ) FRB sources at present and that a dedicated radio survey (by either FAST or MeerKat) of  ( 10 ) hr has a 90% probability of detecting a globular cluster FRB in M87. The detection of even a handful of additional globular cluster FRBs would provide invaluable constraints on FRB mechanisms and population properties. Previous studies have demonstrated young neutron stars formed following the collapse of dynamically formed massive white dwarf binary mergers may provide the most natural mechanism for these bursts. We explore the white dwarf merger scenario using a suite of N-body cluster models, focusing in particular on such mergers in M87's clusters. We describe a number of outstanding features of this scenario that in principle may be testable with an ensemble of observed FRBs in nearby globular clusters.

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Section: Estimating Local Frb Source Counts and Ratesmentioning

confidence: 99%

Section: Estimating Local Frb Source Counts and Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies

Kremer

et al. 2023

ApJ

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“…On the other hand, CHIME/FRB's detection pipeline operates on data having time resolution of 0.983 ms, so much narrower bursts, especially if faint, are selected against, a bias not made clear by the constant fluence injection model used when demonstrating our bias (see Merryfield et al 2022). Hence, bursters having very narrow, frequent bursts (e.g., Nimmo et al 2022b) are not well represented here. Nevertheless, the correlation we detect is present in our data and may represent a genuine astrophysical trend.…”

Section: Burst Ratesmentioning

confidence: 99%

“…Those and other model fits are, however, sensitive to the inclusion of repeating sources for which only one event has been detected as apparent nonrepeaters. There is also the question of how to model the burst rates of repeaters, as varying levels of burst activity have been observed across the population of identified repeating FRBs, including highly clustered and rarely repeating sources ( §4.4; see also, e.g., Oppermann et al 2018;Good et al 2022;Nimmo et al 2022b). Population synthesis will need to reproduce the observed distribution of repetition rates, while also reproducing the observed differences in other burst properties.…”

Section: Do All Frbs Repeat?mentioning

confidence: 99%

CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Collaboration¹,

Andersen³

et al. 2023

Preprint

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We present the discovery of 25 new repeating fast radio burst (FRB) sources found among CHIME/FRB events detected between 2019 September 30 and 2021 May 1. The sources were found using a new clustering algorithm that looks for multiple events co-located on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from ∼220 pc cm −3 to ∼1700 pc cm −3 , and include sources having exhibited as few as two bursts to as many as twelve. We report a statistically significant difference in both the DM and extragalactic DM (eDM) distributions between repeating and apparently nonrepeating sources, with repeaters having lower mean DM and eDM, and we discuss the implications. We find no clear bimodality between the repetition rates of repeaters and upper limits on repetition from apparently nonrepeating sources after correcting for sensitivity and exposure effects, although some active repeating sources stand out as anomalous. We measure the repeater fraction and find that it tends to an equilibrium of 2.6 +2.9 −2.6 % over our exposure thus far. We also report on 14 more sources which are promising repeating FRB candidates and which merit follow-up observations for confirmation.

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A sample of Fast Radio Bursts discovered and localised with MeerTRAP at the MeerKAT telescope

Jankowski,

Bezuidenhout,

Caleb

et al. 2023

Preprint

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We present a sample of well-localised Fast Radio Bursts (FRBs) discovered by the MeerTRAP project at the MeerKAT telescope in South Africa. We discovered the three FRBs in single coherent tied-array beams and localised them to an area of ∼1 arcmin 2 . We investigate their burst properties, scattering, repetition rates, and localisations in a multiwavelength context. FRB 20201211A shows hints of scatter broadening but is otherwise consistent with instrumental dispersion smearing. For FRB 20210202D, we discovered a faint post-cursor burst separated by ∼200 ms, suggesting a distinct burst component or a repeat pulse. We attempt to associate the FRBs with host galaxy candidates. For FRB 20210408H, we tentatively (0.35 -0.53 probability) identify a compatible host at a redshift ∼0.5. Additionally, we analyse the MeerTRAP survey properties, such as the survey coverage, fluence completeness, and their implications for the FRB population. Based on the entire sample of 11 MeerTRAP FRBs discovered by the end of 2021, we estimate the FRB all-sky rates and their scaling with the fluence threshold. The inferred FRB all-sky rates at 1.28 GHz are 4.4 +4.3 −2.5 and 2.1 +1.8 −1.1 × 10 3 sky −1 d −1 above 0.66 and 3.44 Jy ms for the coherent and incoherent surveys, respectively. The scaling between the MeerTRAP rates is flatter than at higher fluences at the 95 per cent confidence level. There seems to be a deficit of low-fluence FRBs, suggesting a break or turn-over in the rate versus fluence relation below 2 Jy ms. We speculate on cosmological or progenitor-intrinsic origins. The cumulative source counts within our surveys appear consistent with the Euclidean scaling.

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A burst storm from the repeating FRB 20200120E in an M81 globular cluster

Cited by 3 publications

References 0 publications

Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies

Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies

CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

A sample of Fast Radio Bursts discovered and localised with MeerTRAP at the MeerKAT telescope

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