CHIME/FRB Discovery of Eight New Repeating Fast Radio Burst Sources

Abstract

We report on the discovery of eight repeating fast radio burst (FRB) sources found using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. These sources span a dispersion measure (DM) range of 103.5-1281 pc cm −3 . They display varying degrees of activity: six sources were detected twice, another three times, and one 10 times. These eight repeating FRBs likely represent the bright and/or high-rate end of a distribution of infrequently repeating sources. For all sources, we determine sky coordinates with uncertainties of ∼10′. FRB 180916.J0158+65 has a burst-averaged DM=349.2±0.3 pc cm −3 and a low DM excess over the modeled Galactic maximum (as low as ∼20 pc cm −3 ); this source also has a Faraday rotation measure (RM) of −114.6±0.6 rad m −2 , which is much lower than the RM measured for FRB 121102. FRB 181030.J1054+73 has the lowest DM for a repeater, 103.5±0.3 pc cm −3 , with a DM excess of ∼70 pc cm −3 . Both sources are interesting targets for multi-wavelength follow-up due to their apparent proximity. The DM distribution of our repeater sample is statistically indistinguishable from that of the first 12 CHIME/FRB sources that have not yet repeated. We find, with 4σ significance, that repeater bursts are generally wider than those of CHIME/FRB bursts that have not repeated, suggesting different emission mechanisms. Many of our repeater events show complex morphologies that are reminiscent of the first two discovered repeating FRBs. The repetitive behavior of these sources will enable interferometric localizations and subsequent host galaxy identifications.

Luminosity–duration relations and luminosity functions of repeating and non-repeating fast radio bursts

“…We note that the difference in w int,rest is marginal, when individual repeats of repeating FRBs are compared with that of non-repeating FRBs. A difference in observed duration between repeating and non-repeating FRBs was reported by CHIME/FRB Collaboration et al (2019c). We confirmed it with a more physically motivated parameter, w int,rest .…”

“…In Fig. 5 there are, at least, two repeating FRBs which change the L ν dramatically from luminous nonrepeating regime to faint repeating one, i.e., FRB 171019 and 181017.J1705+68 (Kumar et al 2019;CHIME/FRB Collaboration et al 2019c). Kumar et al (2019) reported repetitions of FRB 171019 which are 590 times fainter than the one discovered by ASKAP (brightest burst in Fig.…”

“…Therefore, a comparison of physical properties of repeating and nonrepeating FRBs is one of the most important tasks to understand what makes this phenomenal difference. Recently, CHIME/FRB Collaboration et al (2019c) reported that the observed duration of repeating FRBs detected by CHIME is longer than that of non-repeating FRBs, suggesting different populations between repeating and non-repeating FRBs.…”

A study of repeated bursts FRB 121102 as a radiation from cusps on superconducting cosmic string

“…Спалах FRB 121102 був відкритий у 2014 році [7], а на даний момент є широковідомим та досліджуваним як повторюваний, загальна кількість отриманих спалахів з даного місця спостереження становить 110 шт. FRB 121102 є першим швидким радіоспалахом, що повторюється, і для котрого відомо положення з субарксекундною точністю [8][9][10] [9].…”

A Fast Radio Burst Discovered in FAST Drift Scan Survey

“…Most FRBs seemed to be one-off events, while some are repeating (Spitler et al 2016). CHIME has been particularly effective at finding repeating FRBs, with 17 published so far (Amiri et al 2019b;Andersen et al 2019). The origin of these FRBs remains a hot topic of debate and speculation (Platts et al 2019).…”