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Showing 1 to 20 of 68 for “"MeerKAT"”.
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Probing Cosmology with the MeerKAT Interferometer
… intensity mapping technique with data from the MeerKAT International GHzTiered Extragalactic Explorations (MIGHTEE) Survey. In particular, 17.45 hours of data on the COSMOS field is used to measure the Hi power spectrum signal in the Early Science frequency range of 1310- 1420 MHz, in a sub-band …
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MeerKAT observations of novalike cataclysmic variables
… variables in the radio band, using the MeerKAT radio interferometer. Radio emission is detected from four out of the eleven systems: IM Eri, RW Sex, V3885 Sgr and V603 Aql. While RW Sex, V3885 Sgr and V603 Aql had been previously detected, this is the first reported radio detection of IM …
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The MeerKAT Radio Frequency Interference Environment
… are few dedicated RFI monitoring systems on the MeerKAT site, the most sensitive RFI detector is the MeerKAT array itself. In this thesis we use approximately 1500 hours of MeerKAT observations to create a multi-dimensional view of the RFI at the MeerKAT site. Here we investigate a probabilistic …
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RFI monitoring for the MeerKAT Radio Telescope
South Africa is currently building MeerKAT, a 64 dish radio telescope array, as a pre-cursor for the proposed Square Kilometre Array (SKA). Both telescopes will be located at a remote site in the Karoo with a low level of Radio Frequency Interference (RFI). It is important to maintain a low level …
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The discovery and characterization of astrophysical transients with MeerKAT
I present the findings of our commensal search for radio transients in the LADUMA field using SARAO Science Data Processor (SDP) UHF-band images, covering∼1 year of observations. Employing the Transient Pipeline (TraP), I identified source candidates within the LADUMA field, and applied additional …
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Probing diffuse galactic synchrotron emission using meerkat single dish data
In recent experiments, the 21 cm neutral hydrogen (HI) line has been measured using the intensity mapping (IM) method. Measuring this HI line is a complex process because it is faint and easily contaminated by radio frequency interference (RFI) and the foregrounds. Using the MeerKLASS experiment, …
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Concept Demonstrator for MeerKAT Operation from 14.5 to 20 GHz
… system operating from 14.5 to 20 GHz for the MeerKAT Radio Telescope is presented. MeerKAT is a 64 element telescope antenna array consisting of offset-fed Gregorian reflector antennas with a 13.5 m main reflector and 3.8 m sub-reflector. Currently, the MeerKAT is planned to operate up to 14.5 …
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A GPU based X-Engine for the MeerKAT Radio Telescope
… a modern radio telescope array. The 64 antenna MeerKAT telescope has an FX architecture correlator consisting of 64 F-Engines and 256 X-Engines. These F- and X-Engines are all hosted on 128 custom designed FPGA processing boards. This custom board is known as a SKARAB. One SKARAB X-Engine board …
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Studying the southerly eclipsing millisecond pulsar J1748-2446A using MeerKAT
… we used two observations from the South African MeerKAT telescope at L-band frequencies. As PSR J1748-2446A transitions in and out of an eclipse, our observations of its radio emission noted a maximum dispersion measure (DM) increase of 0.089 pc cm−3 in Observation 1 and of 0.055 pc cm−3 in …
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Thermal design and analysis of the SKA SA MeerKAT Digitiser
… Africa (SKA SA) is currently constructing the MeerKAT Radio Telescope in the Karoo Desert. Radio telescopes are conventionally designed to have the signal Digitiser located in the pedestal of the radio telescope antenna structure to shield the incoming radio signal from being contaminated by …
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Mission Planning Tool for space debris studies with the MeerKAT radar
… of building an active radar system employing the MeerKAT radio telescope as receiver for space debris detection, tracking and imaging. This dissertation details the development of a Mission Planning Tool (MPT) to perform sensor scheduling and to support the performance prediction and analysis of …
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Immersion cooled environmental monitoring and prediction system for the meerKAT imager
… centre. This study involves a case study of the MeerKAT Science Processor that is responsible for the MeerKAT imaging pipeline. Immersion cooling brings a coolant into direct physical contact with the chips and the circuit board by directly immersing computing equipment into a bath of cooling …
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X-band digitization systems aspects and filters for MeerKAT radio astronomy receiver
The MeerKAT Radio Telescope is a 64 element antenna array under construction in South Africa. This array will be used to observe radiation from celestial sources at radio frequencies. Once completed, this radio telescope will be the largest and most sensitive radio telescope in the Southern …
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The very high energy gamma ray burst GRB190114C as observed by MeerKAT
We present the MeerKAT study of the highly energetic gamma ray burst (GRB), GRB190114C, which was the first GRB to have been recorded at teraelectronvolt (TeV) energies by the MAGIC telescope. We have observed this GRB with MeerKAT from as early as within the first day of the burst event, up to …
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A study of satellite contamination for single dish Hi intensity mapping with MeerKAT
… used for this work has been obtained from the MeerKAT pilot survey which was collected from 62 hours of observation using the MeerKAT telescope’s 64 dish array in single dish mode. In this work, we attempt to use the higher L-Band frequency data (1300 - 1500 MHz) and understand the foreground …
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Wideband spectropolarimetry of extragalactic radio sources with KAT 7 and commissioning phase MeerKAT
… phase of the South African SKA precursor, MeerKAT. The MeerKAT observations are of the DEEP field, a radio quiet region in the southern sky. These observations were made at frequencies 890 MHz to 1702 MHz. Following data calibrations, we made sensitive (down to ∼ 7 µJy/beam) high resolution …
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A scalable database model of RFI data for the MeerKAT/SKA radio telescope
… or prevent future interference events. At the MeerKAT radio telescope (a precursor to the Square Kilometre Array, and one of the largest and most sensitive radio telescopes in the world to date), RFI is captured in different formats using a variety of devices including telescopes, sensors and …
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Exploring the evolution and hidden large-scale structures of galaxies with MeerKAT HI surveys
… with the emergence of SKA Pathfinders such as MeerKAT and ASKAP. Deep systematic interferometric H I surveys of unprecedented sensitivity and resolution over very wide angles of the sky are now possible. In this thesis, I use the capabilities of MeerKAT to explore H I galaxy scaling relations …
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System design of the MeerKAT L - band 3D radar for monitoring near earth objects
… cooperative use of the KAT-7 (7 antennas) and MeerKAT (64 antennas) radio telescope receivers in a radar system to improve monitoring of small debris and PHAs was investigated using theory and simulations, as a cost-effective solution. Parameters for a low cost and high-performance radar were …
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Exploring the evolution and hidden large-scale structures of galaxies with MeerKAT HI surveys
… with the emergence of SKA Pathfinders such as MeerKAT and ASKAP. Deep systematic interferometric H I surveys of unprecedented sensitivity and resolution over very wide angles of the sky are now possible. In this thesis, I use the capabilities of MeerKAT to explore H I galaxy scaling relations …
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