Radio afterglows of Gravitational Waves

d’Antonio, Daniele

Radio afterglows of Gravitational Waves

d’Antonio, Daniele

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Publication Type:: Thesis
Issue Date:: 2022

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Field	Value	Language
dc.contributor.author	d’Antonio, Daniele
dc.date.accessioned	2023-09-19T02:43:09Z
dc.date.available	2023-09-19T02:43:09Z
dc.date.issued	2022
dc.identifier.uri	http://hdl.handle.net/10453/172196
dc.description	University of Technology Sydney. Faculty of Science.	en_US.UTF-8
dc.description.abstract	This thesis describes a study of the research conducted by myself during these years as a PhD candidate working at the University of Technology, Sydney (UTS) and the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The thesis is divided in two main parts: the first part is comprised of research analysing the radio variable sky with a classical approach while the second part proposes the usage of statistical techniques poorly used in Astrophysics at the moment of writing this work. Firstly, a comprehensive description of the instrumentation which has involved my research work. The instrumentation consists in the Australia Telescope Compact Array (ATCA), The Australian Square Kilometre Pathfinder (ASKAP), the Swift Gamma-ray Burst Explorer (Swi f t), the High Energy Stereoscopic System (HESS) and the two Michelson interferometers the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo. Principles of radio astronomy observations are also reported. Secondly, a transients follow-up with the Australia Telescope Compact Array is presented. The research project comprised the study of the gamma-ray burst GRB190114c, the two flare stars AT Mic and UV Ceti. The investigation has been carried out by using the Rapid Response Mode. This modality consists in triggering radio telescopes as soon as a transient is detected by X-ray and gamma-ray telescopes. The analysis of the gamma-ray burst revealed possible scintillation while the flare stars activity could be due to gyrosynchrotron radiation, electron cyclotron maser or plasma radiation. Furthermore, campaign for detecting ultra-cool dwarfs (UCDs). These objects are hardly detectable and at the time of writing this work, only 25 sources were detected. The campaign is based on searching for objects with photometric variability and fast rotation. The search allowed to detect at least 3 objects from 11 radio observations. Moreover, a study of variable active galactic nuclei (AGN) using the Australian Square Kilometre Pathfinder (ASKAP) is outlined. This research has been conducted with a targeted approach by selecting ASKAP sources listed in AGN catalogues. The study showed the detection of 30 variable AGN. The most likely explanation for their radio variability is scintillation because of the brightness temperature values above the Compton catastrophe limit of 10^12 K. Finally, the second part of this thesis is an analysis of innovative methods for studying variable and transient sources in Astrophysics. The work involves the study of light curves by using statistical methods named State Space Models to detect gravitational waves.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/172196/2/02whole.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2022 Daniele d’Antonio
dc.rights	au.edu.uts.lib/cph
dc.title	Radio afterglows of Gravitational Waves	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

This thesis describes a study of the research conducted by myself during these years as a PhD candidate working at the University of Technology, Sydney (UTS) and the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The thesis is divided in two main parts: the first part is comprised of research analysing the radio variable sky with a classical approach while the second part proposes the usage of statistical techniques poorly used in Astrophysics at the moment of writing this work. Firstly, a comprehensive description of the instrumentation which has involved my research work. The instrumentation consists in the Australia Telescope Compact Array (ATCA), The Australian Square Kilometre Pathfinder (ASKAP), the Swift Gamma-ray Burst Explorer (Swi f t), the High Energy Stereoscopic System (HESS) and the two Michelson interferometers the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo. Principles of radio astronomy observations are also reported. Secondly, a transients follow-up with the Australia Telescope Compact Array is presented. The research project comprised the study of the gamma-ray burst GRB190114c, the two flare stars AT Mic and UV Ceti. The investigation has been carried out by using the Rapid Response Mode. This modality consists in triggering radio telescopes as soon as a transient is detected by X-ray and gamma-ray telescopes. The analysis of the gamma-ray burst revealed possible scintillation while the flare stars activity could be due to gyrosynchrotron radiation, electron cyclotron maser or plasma radiation. Furthermore, campaign for detecting ultra-cool dwarfs (UCDs). These objects are hardly detectable and at the time of writing this work, only 25 sources were detected. The campaign is based on searching for objects with photometric variability and fast rotation. The search allowed to detect at least 3 objects from 11 radio observations. Moreover, a study of variable active galactic nuclei (AGN) using the Australian Square Kilometre Pathfinder (ASKAP) is outlined. This research has been conducted with a targeted approach by selecting ASKAP sources listed in AGN catalogues. The study showed the detection of 30 variable AGN. The most likely explanation for their radio variability is scintillation because of the brightness temperature values above the Compton catastrophe limit of 10^12 K. Finally, the second part of this thesis is an analysis of innovative methods for studying variable and transient sources in Astrophysics. The work involves the study of light curves by using statistical methods named State Space Models to detect gravitational waves.

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