Marcus Merryfield
A5001316118- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- earthquake and tectonic studies
- GNSS positioning and interference
- Ionosphere and magnetosphere dynamics
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Earthquake Detection and Analysis
- Non-Invasive Vital Sign Monitoring
- Astrophysics and Cosmic Phenomena
- Statistical and numerical algorithms
McGill University
2019-2024
Herzberg Institute of Astrophysics
2018
University of Victoria
2018
We report on the discovery of eight repeating fast radio burst (FRB) sources found using Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. These span a dispersion measure (DM) range 103.5 to 1281 pc cm$^{-3}$. They display varying degrees activity: six were detected twice, another three times, and one ten times. FRBs likely represent bright and/or high-rate end distribution infrequently sources. For all sources, we determine sky coordinates with uncertainties...
We present a catalog of 536 fast radio bursts (FRBs) detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project between 400 and 800 MHz from 2018 July 25 to 2019 1, including 62 18 previously reported repeating sources. The represents first large sample, repeaters non-repeaters, observed in single survey with uniform selection effects. This facilitates comparative absolute studies FRB population. show that apparent non-repeaters have sky locations...
Abstract We report on the discovery and analysis of bursts from nine new repeating fast radio burst (FRB) sources found using Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. These span a dispersion measure (DM) range 195–1380 pc cm −3 . detect two three sources, four one source, five source. determine sky coordinates all with uncertainties ∼10′. Faraday rotation measures (RMs) for values −20(1) −499.8(7) rad m −2 , that are substantially lower than RM derived emitted by FRB...
Abstract Fast radio bursts (FRBs) are brief, energetic, typically extragalactic flashes of emission whose progenitors largely unknown. Although studying the FRB population is essential for understanding how these astrophysical phenomena occur, such studies have been difficult to conduct without large numbers FRBs and characterizable observational biases. Using recently released catalog 536 published by Canadian Hydrogen Intensity Mapping Experiment/Fast Radio Burst (CHIME/FRB) collaboration,...
Abstract We report on the detection of seven bursts from periodically active, repeating fast radio burst (FRB) source FRB 180916.J0158+65 in 300–400 MHz frequency range with Green Bank Telescope (GBT). Emission multiple is visible down to bottom GBT band, suggesting that cutoff (if it exists) for emission lower than 300 MHz. Observations were conducted during predicted periods activity source, and had simultaneous coverage Low Frequency Array (LOFAR) backend Canadian Hydrogen Intensity...
Abstract We report on the host association of FRB 20181030A, a repeating fast radio burst (FRB) with low dispersion measure (103.5 pc cm −3 ) discovered by CHIME/FRB Collaboration et al. Using baseband voltage data saved for its repeat bursts, we localize to sky area 5.3 arcmin 2 (90% confidence). Within localization region, identify NGC 3252 as most promising an estimated chance-coincidence probability <2.5 × 10 . Moreover, do not find any other galaxy M r < −15 AB mag within region...
Abstract We present a Monte Carlo–based population synthesis study of fast radio burst (FRB) dispersion and scattering focusing on the first catalog sources detected with Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) project. simulate intrinsic properties propagation effects for variety FRB models compare simulated distributions measures timescales corresponding from CHIME/FRB catalog. Our simulations confirm results previous studies, which suggested that...
Abstract In 2021, a catalog of 536 fast radio bursts (FRBs) detected with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope was released by CHIME/FRB Collaboration. This large collection bursts, observed single instrument and uniform selection effects, has advanced our understanding FRB population. Here we update results for 140 these FRBs which channelized raw voltage (“baseband”) data are available. With voltages measured telescope’s antennas, it is possible to maximize...
New radio (MeerKAT and Parkes) X-ray (XMM-Newton, Swift, Chandra, NuSTAR) observations of PSR J1622-4950 indicate that the magnetar, in a quiescent state since at least early 2015, reactivated between 2017 March 19 April 5. The flux density, while variable, is approximately 100x larger than during its dormant state. one month after reactivation was 800x quiescence, has been decaying exponentially on 111+/-19 day timescale. This high-flux state, together with radio-derived rotational...
Abstract We report the detection of a single burst from first-discovered repeating fast radio (FRB) source, FRB 121102, with Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope, which operates in frequency band 400–800 MHz. The detected occurred on 2018 November 19 and its emission extends down to at least 600 MHz, lowest this source yet. burst, significance 23.7 σ , has fluence 12 ± 3 Jy ms shows complex time morphology. 34 width is largest seen for object any frequency. find...
Abstract Dedicated surveys searching for fast radio bursts (FRBs) are subject to selection effects that bias the observed population of events. Software injection systems one method correcting these biases by injecting a mock synthetic FRBs directly into real-time search pipeline. The injected may then be used map intrinsic burst properties onto an expected signal-to-noise ratio (S/N), so long as telescope characteristics such beam model and calibration factors properly accounted for. This...
We report on simultaneous radio and X-ray observations of the repeating fast burst source FRB 180916.J0158+65 using Canadian Hydrogen Intensity Mapping Experiment (CHIME), Effelsberg, Deep Space Network (DSS-14 DSS-63) telescopes Chandra Observatory. During 33 ks observations, we detect no bursts in overlapping Effelsberg or a single during CHIME/FRB transits. events excess background observations. These non-detections imply 5-$\sigma$ limit $<5\times10^{-10}$ erg cm$^{-2}$ for 0.5--10 keV...
Abstract Fast radio bursts (FRBs) are bright transients of microsecond to millisecond duration and unknown extragalactic origin. Central the mystery FRBs their extremely high characteristic energies, which surpass typical energies other similar duration, like Galactic pulsar magnetar bursts, by orders magnitude. Calibration FRB-detecting telescopes for burst flux fluence determination is crucial FRB science, as these measurements enable studies energy brightness distribution in comparison...
Abstract The origin of fast radio bursts (FRBs), millisecond-duration flashes waves that are visible at distances billions light-years, remains an open astrophysical question. Here we report the detection multi-component FRB 20191221A with Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project (CHIME/FRB), and identification a periodic separation 216.8(1) ms between its components significance 6.5 sigmas. long (~ 3 s) duration nine or more forming pulse profile make this...
Fast radio bursts (FRBs) are bright transients of micro-to-millisecond duration and unknown extragalactic origin. Central to the mystery FRBs their extremely high characteristic energies, which surpass typical energies other similar duration, like Galactic pulsar magnetar bursts, by orders magnitude. Calibration FRB-detecting telescopes for burst flux fluence determination is crucial FRB science, as these measurements enable studies energy brightness distribution in comparison progenitor...
Dedicated surveys searching for Fast Radio Bursts (FRBs) are subject to selection effects which bias the observed population of events. Software injection systems one method correcting these biases by injecting a mock synthetic FRBs directly into realtime search pipeline. The injected may then be used map intrinsic burst properties onto an expected signal-to-noise ratio (SNR), so long as telescope characteristics such beam model and calibration factors properly accounted for. This paper...
In 2021, a catalog of 536 fast radio bursts (FRBs) detected with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope was released by CHIME/FRB Collaboration. This large collection bursts, observed single instrument and uniform selection effects, has advanced our understanding FRB population. Here we update results for 140 these FRBs which channelized raw voltage (baseband) data are available. With voltages measured telescope's antennas, it is possible to maximize sensitivity...
Fast radio bursts (FRBs) are brief, energetic, extragalactic flashes of emission whose progenitors largely unknown. Although studying the FRB population is essential for understanding how these astrophysical phenomena occur, such studies have been difficult to conduct without large numbers FRBs and characterizable observational biases. Using recently released catalog 536 published by Canadian Hydrogen Intensity Mapping Experiment/Fast Radio Burst (CHIME/FRB) collaboration, we present a study...