Kevin Bandura
A5080586585- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Antenna Design and Optimization
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- earthquake and tectonic studies
- Microwave Engineering and Waveguides
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Soil Moisture and Remote Sensing
- Ionosphere and magnetosphere dynamics
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Electromagnetic Compatibility and Measurements
- Geophysics and Sensor Technology
West Virginia University
2016-2025
Morgantown High School
2021-2025
Lane College
2021
Day One
2020
McGill University
2013-2016
Carnegie Mellon University
2008-2013
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...
The GMRT Epoch of Reionization (EoR) experiment is an ongoing effort to measure the power spectrum from neutral hydrogen at high redshift. We have previously reported upper limit (70 mK)^2 wavenumbers k=0.65 h/Mpc using a basic piecewise-linear foreground subtraction. In this paper we explore use singular value decomposition remove foregrounds with fewer assumptions about structure. Using method also quantify, for first time, signal loss due filter and present new spectra adjusted loss,...
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...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400-800MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on compact grid map most of the southern sky over course four years. has two primary science goals: to constrain Dark Energy measure structure at high redshift, study transients pulsars. observe unresolved sources neutral hydrogen via their redshifted 21-cm emission line (`hydrogen...
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...
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...
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...
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...
Abstract The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a novel transit radio telescope operating across the 400–800 MHz band. CHIME composed of four 20 m × 100 semicylindrical paraboloid reflectors, each which has 256 dual-polarization feeds suspended along its axis, giving it ≳200 deg 2 field view. This, combined with wide bandwidth, high sensitivity, and powerful correlator, makes an excellent instrument for detection fast bursts (FRBs). Fast Radio Burst Project (CHIME/FRB)...
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 The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has become a leading facility for detecting fast radio bursts (FRBs) through the CHIME/FRB backend. searches transients in polarization-summed intensity data streams that have 24 kHz spectral and 1 ms temporal resolution. beams are pointed to predetermined locations sky. A triggered baseband system records coherent electric field measured by each antenna CHIME array at time of FRB detections. Here we describe analysis...
Abstract The repeating FRB 20201124A was first discovered by CHIME/FRB in November of 2020, after which it seen to repeat a few times over several months. It entered period high activity April 2021, at time observatories recorded tens hundreds more bursts from the source. These follow-up observations enabled precise localization and host-galaxy identification. In this paper, we report on CHIME/FRB-detected 20201124A, including their best-fit morphologies, fluences, arrival times. large...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio interferometer array currently in development, with an initial 256-element to be deployed at the South African Radio Astronomy Observatory (SARAO) Square Kilometer Array (SKA) site Africa. Each of 6m, $f/0.23$ dishes will instrumented dual-polarisation feeds operating over frequency range 400-800 MHz. Through intensity mapping 21 cm emission line neutral hydrogen, HIRAX provide cosmological survey distribution...
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...
Abstract Localizing fast radio bursts (FRBs) to their host galaxies is an essential step better understanding origins and using them as cosmic probes. The Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB Outriggers program aims add very long baseline interferometry localization capabilities CHIME, such that FRBs may be localized tens of milliarcsecond precision at the time discovery, more than sufficient for galaxy identification. first-built outrigger telescope Outrigger (KKO),...