Kiyoshi W. Masui
A5013125693- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- GNSS positioning and interference
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Advanced Frequency and Time Standards
- Dark Matter and Cosmic Phenomena
- earthquake and tectonic studies
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- Statistical and numerical algorithms
- Geophysics and Sensor Technology
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- History and Developments in Astronomy
- Antenna Design and Optimization
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Seismology and Earthquake Studies
- Scientific Research and Discoveries
Massachusetts Institute of Technology
2017-2025
Kavli Institute for Particle Astrophysics and Cosmology
2020-2024
University of Toronto
2010-2024
Moscow Institute of Thermal Technology
2019
University of British Columbia
2014-2018
Canadian Institute for Advanced Research
2014-2016
Canadian Institute for Theoretical Astrophysics
2010-2013
Defence Research and Development Canada
2008
Osaka Electro-Communication University
2000
Central Research Laboratories (United Kingdom)
1975
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...
In this letter, 21 cm intensity maps acquired at the Green Bank Telescope are cross-correlated with large-scale structure traced by galaxies in WiggleZ Dark Energy Survey. The data span redshift range 0.6 < z 1 over two fields totaling ~41 deg. sq. and 190 hours of radio integration time. cross-correlation constrains Omega_HI b_HI r = [0.43 \pm 0.07 (stat.) 0.04(sys.)] x 10^-3, where is neutral hydrogen HI fraction, galaxy-hydrogen correlation coefficient, bias parameter. This most...
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 The large-scale distribution of neutral hydrogen in the Universe will be luminous through its 21 cm emission. Here, for first time, we use auto-power spectrum intensity fluctuations to constrain at z ∼ 0.8. Our data were acquired with Green Bank Telescope and span redshift range 0.6 &lt; 1 over two fields totalling ≈41 deg2 190 h radio integration time. dominant synchrotron foregrounds exceed signal by ∼103, but have fewer degrees freedom can removed efficiently. Even presence...
We report on the discovery of FRB 20200120E, a repeating fast radio burst (FRB) with low dispersion measure (DM), detected by Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB project. The source DM 87.82 pc cm$^{-3}$ is lowest recorded from an to date, yet significantly higher than maximum expected Milky Way interstellar medium in this direction (~ 50 cm$^{-3}$). have three bursts and one candidate over period 2020 January-November. baseband voltage data for event January 20...
Abstract We present a synthesis of fast radio burst (FRB) morphology (the change in flux as function time and frequency) detected the 400–800 MHz octave by FRB project on Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB), using events from first CHIME/FRB catalog. The catalog consists 62 bursts 18 repeating sources, plus 474 one-off FRBs, between 2018 July 25 2019 2. identify four observed archetypes (“simple broadband,” “simple narrowband,” “temporally complex,” “downward...
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400-800 MHz band. CHIME located at Dominion Radio Astrophysical Observatory near Penticton, BC Canada. instrument designed to map neutral hydrogen over redshift range 0.8 2.5 constrain expansion history of Universe. This goal drives design features instrument. consists four parallel cylindrical reflectors, oriented north-south, each 100 m $\times$ 20 and outfitted with 256 element...
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 were using a clustering algorithm that looks for multiple co-located on sky having similar dispersion measures (DMs). repeaters have DMs ranging from $\sim$220 pc cm$^{-3}$ to $\sim$1700 cm$^{-3}$, include exhibited as few two bursts many twelve. report statistically significant difference in both DM extragalactic (eDM) distributions...
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,...
We present a detection of 21-cm emission from large-scale structure (LSS) between redshift 0.78 and 1.43 made with the Canadian Hydrogen Intensity Mapping Experiment (CHIME). Radio observations acquired over 102 nights are used to construct maps which foreground filtered stacked on angular spectral locations luminous red galaxies (LRG), line (ELG), quasars (QSO) eBOSS clustering catalogs. find decisive evidence for when stacking all three tracers LSS, logarithm Bayes Factor equal 18.9 10.8...
Abstract We present a search for host galaxy associations the third set of repeating fast radio burst (FRB) sources discovered by CHIME/FRB Collaboration. Using ∼1′ baseband localizations and probabilistic methods, we identify potential galaxies two FRBs, 20200223B 20190110C at redshifts 0.06024(2) 0.12244(6), respectively. also discuss properties marginal candidate association FRB 20191106C with redshift 0.10775(1). The three putative are all relatively massive, fall on standard...
Abstract We present the host galaxies of four apparently nonrepeating fast radio bursts (FRBs), FRB 20181223C, 20190418A, 20191220A, and 20190425A, reported in first Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB) catalog. Our selection these FRBs is based on a planned hypothesis testing framework where we search all CHIME/FRB Catalog-1 events that have low extragalactic dispersion measure (<100 pc cm −3 ), with high Galactic latitude (∣ b ∣ > 10°) saved baseband data....
Abstract We report the discovery of repeating fast radio burst (FRB) source FRB 20240209A using Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB telescope. detected 22 bursts from this repeater between 2024 February and July, 6 which were also recorded at Outrigger station k’niʔatn k’l ⌣ stk’masqt (KKO). The multiple very long baseline interferometry localizations 66 km CHIME–KKO baseline, each with a different vector orientation due to repeater’s high decl. ∼86°, enabled combined...
Abstract The discovery and localization of FRB 20240209A by the Canadian Hydrogen Intensity Mapping Fast Radio Burst (CHIME/FRB) experiment marks first repeating localized with CHIME/FRB Outriggers adds to small sample FRBs associated host galaxies. Here we present Keck Gemini observations that reveal a redshift z = 0.1384 ± 0.0004. We perform stellar population modeling jointly fit optical through mid-IR data infer median mass log( M * / ⊙ ) 11.35 0.01 mass-weighted age ~11 Gyr,...
A pathfinder version of CHIME (the Canadian Hydrogen Intensity Mapping Experiment) is currently being commissioned at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC. The instrument a hybrid cylindrical interferometer designed to measure large scale neutral hydrogen power spectrum across redshift range 0.8 2.5. will be used baryon acoustic oscillation (BAO) this poorly probed where dark energy becomes significant contributor evolution Universe. revives cylinder design...