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

James, C.W.

doi:10.1017/pasa.2023.51

Cited by 4 publications

(1 citation statement)

References 92 publications

(134 reference statements)

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“…The power-law burst rate distribution we have considered from James (2023) produces a good match for the data through CHIME/FRB Collaboration (2023), which to date has reported a near-linear pattern of detection incidence. After scaling the number of sources to match the total number of cumulative detections by CHIME/FRB to date, our model predicts this almost linear trend will continue for the next decade, in agreement with James (2023). Any drop in this overall detection rate within the next few years would clearly challenge this model.…”

Section: Repeater Detections Versus Timesupporting

confidence: 69%

Modeling Current and Future High-cadence Surveys of Repeating Fast Radio Burst Populations

McGregor,

Lorimer

2024

ApJ

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In recent years, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) interferometer has revealed a large number of fast radio bursts (FRBs), including a sizable population that demonstrates repeating behavior. This transit facility, employing a real-time FRB search pipeline, continually scans the sky with declinations between −10° and 90° for events with fluences ⪆0.4 Jy ms. We simulate a population of repeating FRBs by performing Monte Carlo simulations of underlying source populations processed through a mock CHIME/FRB observing pipeline. Assuming intrinsic repeater rates follow a Poisson distribution, we test assumptions about the burst populations of the repeater sample, and construct models of the FRB sample assuming various cosmological distributions. We infer the completeness of CHIME/FRB observations as a function of observing cadence and redshifts out to 0.5. We find that, if all simulated bursts have a fixed Poisson probability of repetition over their integrated time of observation, repeating burst detections across comoving volume should continue to grow near linearly on the order of decades. We predict that around 170 of the current CHIME/FRB one-off sources will ultimately repeat. We also make projections for FRB repeaters by future facilities and demonstrate that the number of repeaters they find could saturate on a ∼3 yr timescale.

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Section: Repeater Detections Versus Timesupporting

confidence: 69%

Modeling Current and Future High-cadence Surveys of Repeating Fast Radio Burst Populations

McGregor,

Lorimer

2024

ApJ

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The true fraction of repeating fast radio bursts revealed through CHIME source count evolution

Yamasaki,

Goto,

Ling

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Fast Radio Bursts (FRBs) are classified into repeaters and non-repeaters, with only a few percent of the observed FRB population from the Canadian Hydrogen Intensity Mapping Experiment (CHIME) confirmed as repeaters. However, this figure represents only a lower limit due to the observational biases, and the true fraction of repeaters remains unknown. Correcting for these biases uncovers a notable decline in apparently non-repeating FRB detection rate as the CHIME operational time increases. This finding suggests that a significant portion of apparently non-repeating FRBs could in fact exhibit repetition when observed over more extended periods. A simple population model infers that the true repeater fraction likely exceeds 50 % with 99 % confidence, a figure substantially larger than the observed face value, even consistent with 100 %. This greater prevalence of repeaters had previously gone unnoticed due to their very low repetition rates (∼10−3.5 hr−1 on average). Hence, theoretical FRB models must incorporate these low-rate repeaters. Furthermore, our results indicate a significantly higher repeater volume number density, potentially exceeding observed values by up to 104 times, which in turn impacts comparisons with potential FRB progenitors.

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Polarization Properties of 128 Nonrepeating Fast Radio Bursts from the First CHIME/FRB Baseband Catalog

Pandhi,

Pleunis,

Mckinven

et al. 2024

ApJ

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We present a 400–800 MHz polarimetric analysis of 128 nonrepeating fast radio bursts (FRBs) from the first CHIME/FRB baseband catalog, increasing the total number of FRB sources with polarization properties by a factor of ∼3. A total of 89 FRBs have >6σ linearly polarized detections, 29 FRBs fall below this significance threshold and are deemed linearly unpolarized, and for 10 FRBs, the polarization data are contaminated by instrumental polarization. For the 89 polarized FRBs, we find Faraday rotation measure (RM) amplitudes, after subtracting approximate Milky Way contributions, in the range 0.5–1160 rad m−2 with a median of 53.8 rad m−2. Most nonrepeating FRBs in our sample have RMs consistent with Milky Way–like host galaxies, and their linear polarization fractions range from ≤10% to 100% with a median of 63%. We see marginal evidence that nonrepeating FRBs have more constraining lower limits than repeating FRBs for the host electron-density-weighted line of sight magnetic field strength. We classify the nonrepeating FRB polarization position angle (PA) profiles into four archetypes: (i) single component with constant PA (57% of the sample), (ii) single component with variable PA (10%), (iii) multiple components with a single-constant PA (22%), and (iv) multiple components with different or variable PAs (11%). We see no evidence for population-wide frequency-dependent depolarization, and, therefore, the spread in the distribution of fractional linear polarization is likely intrinsic to the FRB emission mechanism. Finally, we present a novel method to derive redshift lower limits for polarized FRBs without host galaxy identification and test this method on 20 FRBs with independently measured redshifts.

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

Cited by 4 publications

References 92 publications

Modeling Current and Future High-cadence Surveys of Repeating Fast Radio Burst Populations

Modeling Current and Future High-cadence Surveys of Repeating Fast Radio Burst Populations

The true fraction of repeating fast radio bursts revealed through CHIME source count evolution

Polarization Properties of 128 Nonrepeating Fast Radio Bursts from the First CHIME/FRB Baseband Catalog

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