CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Andersen, Bridget C.; Bandura, Kevin; Bhardwaj, Mohit; Boyle, Patrick J.; Brar, Charanjot; Cassanelli, Tomas; Chatterjee, Shami; Chawla, Pragya; Cook, Amanda; Curtin, Alice P.; Dobbs, M.; Dong, Fengqiu Adam; Faber, Jakob T.; Fandino, Mateus; Fonseca, Emmanuel; Gaensler, B. M.; Giri, Utkarsh; Herrera-Martín, Antonio; Hill, Alex S.; Ibik, Adaeze; Josephy, Alexander; Kaczmarek, Jane; Kader, Zarif; Kaspi, V. M.; Landecker, T. L.; Lanman, Adam; Lazda, Mattias; Leung, Calvin; Lin, H.; Masui, Kiyoshi; Mckinven, Ryan; Mena-Parra, Juan; Meyers, Bradley W.; Michilli, D.; Ng, Cherry; Pandhi, Ayush; Pearlman, Aaron B.; Pen, Ue-Li; Petroff, Emily; Pleunis, Ziggy; Rafiei-Ravandi, Masoud; Rahman, Mubdi; Ransom, S. M.; Rénard, A.; Sand, Ketan R.; Sanghavi, Pranav; Scholz, Paul; Shah, Vishwangi; Shin, Kaitlyn; Siegel, Seth R.; Smith, Kendrick M.; Stairs, I. H.; Su, Jianing; Tendulkar, Shriharsh P.; Vanderlinde, K.; Wang, Haochen; Wulf, Dallas; Zwaniga, A. V.

doi:10.3847/1538-4357/acc6c1

Cited by 41 publications

(1 citation statement)

References 90 publications

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“…The determination of redshifts of FRBs using their measured DM values is important for this work, thus we explain it here. The current CHIME/FRB dataset [54][55][56] reports the DM as well as the excess DM of FRBs, which we use to estimate the redshifts of these FRBs. The excess DM receives contributions from the host galaxy, the IGM, and foreground galaxies if any, and is found by subtracting the DM contribution of the Milky Way using the NE2001 model [57].…”

Section: Effect Of Modified Gravity In Lensing Of Fast Radio Burstsmentioning

confidence: 99%

Gravitational lensing in modified gravity: a case study for Fast Radio Bursts

Kalita,

Bhatporia,

Weltman

2023

J. Cosmol. Astropart. Phys.

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Over the last few decades, a plethora of modifications to general relativity have been proposed to solve a host of cosmological and astrophysical problems. Many modified gravity models are now ruled out with further astrophysical observations; some theories are still viable, with, at best, bounds on their parameters set by observations to date. More recently, observations of Fast Radio Bursts have proven to be remarkably powerful tools to constrain cosmology and fundamental physics. In this work, we consider a generic modified gravity theory and consider the implications for gravitational lensing with Fast Radio Bursts. We use a set of Fast Radio Burst observations to constrain the fraction of dark matter made up of primordial black holes in such a theory. We further show that modified gravity adds a screening effect on gravitational lensing similar to the case when there is plasma in the path of the light ray acting as a scattering screen.

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Section: Effect Of Modified Gravity In Lensing Of Fast Radio Burstsmentioning

confidence: 99%

Gravitational lensing in modified gravity: a case study for Fast Radio Bursts

Kalita,

Bhatporia,

Weltman

2023

J. Cosmol. Astropart. Phys.

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The discovery and significance of fast radio bursts

Lorimer,

McLaughlin,

Bailes

2024

Astrophys Space Sci

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In 2007 we were part of a team that discovered the so-called “Lorimer Burst”, the first example of a new class of objects now known as fast radio bursts (FRBs). These enigmatic events are only a few ms in duration and occur at random locations on the sky at a rate of a few thousand per day. Several thousand FRBs are currently known. While it is now well established that they have a cosmological origin, and about 10% of all currently known sources have been seen to exhibit multiple bursts, the origins of these enigmatic sources are currently poorly understood. In this article, we review the discovery of FRBs and present some of the highlights from the vast body of work by an international community. Following a brief overview of the scale of the visible Universe in §1, we describe the key moments in radio astronomy (§2) that led up to the discovery of the Lorimer burst (§3). Early efforts to find more FRBs are described in §4 which led to the discovery of the first repeating source (§5). In §6, as we close out on the second decade of FRBs, we outline some of the many open questions in the field and look ahead to the coming years where many surprises are surely in store.

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Modelling repetition in zDM: A single population of repeating fast radio bursts can explain CHIME data

James

2023

Publ. Astron. Soc. Aust.

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Regardless of whether or not all fast radio bursts (FRBs) repeat, those that do form a population with a distribution of rates. This work considers a power-law model of this population, with rate distribution Φ r ∼ Rγr between Rmin and Rmax. The zDM code is used to model the probability of detecting this population as either apparently once-off or repeat events as a function of redshift, z, and dispersion measure, DM. I demonstrate that in the nearby Universe, repeating sources can contribute significantly to the total burst rate. This causes an apparent deficit in the total number of observed sources (once-off and repeaters) relative to the distant Universe that will cause a bias in FRB population models. Thus instruments with long exposure times should explicitly take repetition into account when fitting the FRB population. I then fit data from The Canadian Hydrogen Intensity Mapping Experiment (CHIME). The relative number of repeat and apparently once-off FRBs, and their DM, declination, and burst rate distributions, can be well-explained by 50–100% of CHIME single FRBs being due to repeaters, with Rmax > 0.75 day–1 above 1039 erg, and This result is surprisingly consistent with follow-up studies of FRBs detected by the Australian Square Kilometre Array Pathfinder (ASKAP). Thus the evidence suggests that CHIME and ASKAP view the same repeating FRB population, which is responsible not just for repeating FRBs, but the majority of apparently once-off bursts. For greater quantitative accuracy, non-Poissonian arrival times, second-order effects in the CHIME response, and a simultaneous fit to the total FRB population parameters, should be treated in more detail in future studies.

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CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Cited by 41 publications

References 90 publications

Gravitational lensing in modified gravity: a case study for Fast Radio Bursts

Gravitational lensing in modified gravity: a case study for Fast Radio Bursts

The discovery and significance of fast radio bursts

Modelling repetition in zDM: A single population of repeating fast radio bursts can explain CHIME data

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