Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Radio Transients"”.
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Multiwavelength Studies of Rotating Radio Transients
… ago, a new class of pulsars called the Rotating Radio Transients (RRATs) was discovered with the Parkes radio telescope in Australia (McLaughlin et al., 2006). These neutron stars are characterized by strong radio bursts at repeatable dispersion measures, but not detectable using standard …
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A Pilot Survey for Astronomical Low Frequency Radio Transients
Dispersed low-frequency radio astronomical pulses may result from exploding primordial black holes, gamma ray bursts, supernovae, or mergers of exotic objects, but have not yet been detected. Detection would be of great scientific significance because such events must involve extreme physics. The …
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A Search for Astrophysical Radio Transients at Meter Wavelengths
… detectable at the low-frequency end of the radio spectrum. Detection of any of these pulses would be significant for the study of the objects themselves, their host environments, and the interstellar/intergalactic medium. Furthermore, a detection of a radio transient from an exploding PBH …
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Searches for Radio Transients using the Long Wavelength Array
… pulses (GPs) from pulsars and search for other radio transients. Using the LWA with a bandwidth of 16 MHz at 39 MHz, we made a 24-hour observation of pulsar radio pulses from PSR B0950+08. The average pulse ux density and pulse width (dominated by "normal" pulses) are consistent with previous …
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Commensal searches for radio transients variables in the data from Mhongoose Large Survey Project
The MeerKAT radio telescope in South Africa, a precursor to the mid-frequency component of the Square Kilometre Array (SKA1-Mid), offers exceptional sensitivity and a wide field of view, making it ideal for exploring time-domain radio astronomy. This dissertation presents the use of MeerKAT images …
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Search and multi-frequency follow-up studies of radio transients: novel approaches and large campaigns
One of the most fascinating phenomena in modern radio astronomy is related to the Fast Radio Bursts (FRBs). FRBs are Jy-intense, ms-duration radio transients of extra-galactic origin, whose nature is not assessed yet. To date, FRBs have been observed only in the radio band. Despite their origin has …
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Detecting optical transients and variables with MeerLICHT
… Due to the time-critical nature of some transients, with prompt emission that can fade rapidly, this delay in follow up observations can result in important information about the event being missed. Thus, the concept of MeerLICHT was born. MeerLICHT is an fully robotic, optical telescope …
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Detecting anomalous transients in meertrap data
… incredible potential for discovery. The MeerKAT radio telescope in South Africa has proven to be an excellent telescope to search for fast radio transients such as pulsars and fast radio bursts (FRBs). MeerTRAP (more TRAnsients and Pulsars), which commensally uses MeerKAT to search for fast radio …
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The discovery and characterization of astrophysical transients with MeerKAT
… 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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Classification of multiwavelength transients with machine learning
… may dramatically increase the detected number of radio transients. Currently radio transient datasets are still very small, allowing spectroscopic classification of all objects of interest. As the event rate increases, follow-up resources must be prioritised by making use of early classification …
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Controlling for the Ionospheric and Baseline-Offset Uncertainties in the CHIME/FRB Outriggers VLBI Network for Milliarcsecond Precision
Fast radio bursts (FRBs) are a novel form of radio transients discovered in 2007. These bright, extragalactic radio signals have an inferred all-sky rate of hundreds of detections per day. The properties of FRBs hold valuable clues about the extreme physical processes driving them while also …
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The very high energy gamma ray burst GRB190114C as observed by MeerKAT
… Our 13 epoch light curve is the most sampled radio light curve of this GRB at low frequencies (1.28 GHz) in comparison to published results. We detail the evolution of GRB190114C as a forward shock in a homogeneous medium for about 100 days post-burst, followed by a jet-break likely occurring …
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A matched filter technique for slow radio transient detection and first demonstration with the Murchison Widefield Array
… sources produce transient phenomena at radio frequencies, but the transient sky at low frequencies (< 300 MHz) remain relatively unexplored. Blind surveys with new widefield radio instruments are filling this gap. Although many of these instruments are limited by the classical confusion …
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Probing the Diversity of Fast Radio Bursts with CHIME/FRB
Fast radio bursts (FRBs) are extremely bright extragalactic radio transients that flash for microseconds to milliseconds at a time, most never to repeat again. Encoded in every observed FRB is information from burst propagation effects, giving us clues about their mysterious origins as well as the …
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Accelerating radio transient detection using the Bispectrum algorithm and GPGPU
Modern radio interferometers such as those in the Square Kilometre Array (SKA) project are powerful tools to discover completely new classes of astronomical phenomena. Amongst these phenomena are radio transients. Transients are bursts of electromagnetic radiation and is an exciting area of …
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The radiation mechanism of fast radio bursts
Recent observations show that fast radio bursts (FRBs) are energetic but probably non-catastrophic events occurring at cosmological distances. The properties of their progenitors are largely unknown in spite of many attempts to determine them using the event rate, duration and energetics. …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
The transient radio universe is a relatively unexplored area of astronomy, offering a variety of phenomena, from solar and Jovian bursts, to flare stars, pulsars, and bursts of Galactic and potentially even cosmological origin. Among these, perhaps the most widely studied radio transients, pulsars …
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A Dedicated Search for Low Frequency Radio Transient Astrophysical Events using ETA
… pulses detectable in the low end of the radio spectrum. Analysis of these pulses could provide valuable information about the sources, and the surrounding and intervening medium. The Eight-meter-wavelength Transient Array (ETA) is a radio telescope dedicated to the search for these pulses …