Kabelo C. Kesebonye
A5073558998- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Electromagnetic Compatibility and Measurements
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
- Climate variability and models
- Meteorological Phenomena and Simulations
- Astronomical Observations and Instrumentation
- Magnetic confinement fusion research
University of KwaZulu-Natal
2021-2023
University of Sussex
2021
MeerKAT’s large number (64) of 13.5 m diameter antennas, spanning 8 km with a densely packed 1 core, create powerful instrument for wide-area surveys, high sensitivity over wide range angular scales. The MeerKAT Galaxy Cluster Legacy Survey (MGCLS) is programme long-track L -band (900−1670 MHz) observations 115 galaxy clusters, observed ∼6−10 h each in full polarisation. first legacy product data release (DR1), made available this paper, includes the visibilities, basic image cubes at ∼8″...
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...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a planned interferometric radio telescope array that will ultimately consist of 1024 close packed 6 m dishes be deployed at the SKA South Africa site. HIRAX survey majority southern sky to measure baryon acoustic oscillations (BAO) using 21 cm hyperfine transition neutral hydrogen. It operate between 400-800 MHz with 391 kHz resolution, corresponding redshift range $0.8 < z 2.5$ minimum $\Delta z/z$ ~0.003. One primary...
Abstract We investigate dust-unbiased star formation rates (SFRs) as a function of the environment in 20 massive clusters ($M_{200}\gt 4\times 10^{14}\, {\rm M}_{\odot }$) between 0.15 &lt; $z$ 0.35 using radio luminosities (L1.4GHz) from recently released MeerKAT Galaxy Cluster Legacy Survey catalogue. use optical data Dark Energy Camera to estimate photo-$z$s and assign cluster membership. observe steady decline fraction (fSF) star-forming galaxies 2R200 centres our full sample, but...
This paper describes the design, implementation, and verification of a test-bed for determining noise temperature radio antennas operating between 400-800 MHz. The requirements this were driven by HIRAX experiment, which uses with embedded amplification, making system characterization difficult in laboratory. consists two large cylindrical cavities, each containing radio-frequency (RF) absorber held at different temperatures (300K 77 K), allowing measurement through well-known 'Y-factor'...
In our study, we show a multiwavelength view of ACT-CL J0019.6+0336 (which hosts radio halo), to investigate the cluster dynamics, morphology, and ICM. We use combination XMM-Newton images, Dark Energy Survey (DES) imaging photometry, SDSS spectroscopic information, 1.16 GHz MeerKAT data study properties. Various X-ray optical morphology parameters are calculated level disturbance. find disturbances in two density map shows elongated axisymmetric structures with main component southeast...
In the current paradigm, high redshift radio halos are expected to be scarce due inverse Compton energy losses and dimming, which cause them intrinsically faint. This low occurrence fraction is predicted by cosmic ray electron turbulent re-acceleration models. To date, only a handful of have been detected at z > 0.8. We report MeerKAT detection halo hosted galaxy cluster ACT-CL J0329.2-2330 = 1.23, making it highest thus far. Using L-band UHF-band observations, we derive spectral index...
We investigate dust-unbiased star formation rates (SFR) as a function of the environment in 20 massive clusters ($M_{200}>4\times10^{14} {\rm M}_{\odot}$) between $0.15
In our study, we show a multiwavelength view of ACT-CL J0019.6+0336 (which hosts radio halo), to investigate the cluster dynamics, morphology, and ICM. We use combination XMM-Newton images, Dark Energy Survey (DES) imaging photometry, SDSS spectroscopic information, 1.16 GHz MeerKAT data study properties. Various X-ray optical morphology parameters are calculated level disturbance. find disturbances in two density map shows elongated axisymmetric structures with main component southeast...