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Dissertations / Theses on the topic 'Transient sky'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 December 2024

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1

Keane, Evan. "The transient radio sky." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/the-transient-radio-sky(37c08735-cd96-4598-a8b9-2d24ef9e871d).html.

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The high time-resolution radio sky represents unexplored astronomical territory where the discovery potential is high. In this thesis I have studied the transient radio sky, focusing on millisecond scales. As such, this work is concerned primarily with neutron stars, the most populous member of the radio transient parameter space. In particular, I have studied the well known radio pulsars and the recently identified group of neutron stars which show erratic radio emission, known as RRATs, which show radio bursts every few minutes to every few hours. When RRATs burst onto the scene in 2006, it
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2

Blagorodnova, Nadejda. "Characterising the Gaia transient sky." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709492.

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3

Piętka, Małgorzata. "Exploring and classifying the transient radio sky." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:f4de6a2e-ec56-4c2c-99ac-a97b1d75d4aa.

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Observations of the transient radio sky provide an insight into the most dynamic and energetic events in the Universe. The exploration of transient and variable sources, for a long time primarily focused on higher frequencies, has recently been extended to the long wavelength regime, with the development of facilities such as the Low Frequency Array (LOFAR). In this work I describe the general design of LOFAR as well as details of the commissioning work performed during the early stages of operation. Secondly, I perform an analysis of the first dedicated LOFAR transient survey - the Radio Sky
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4

Stewart, Adam James. "Multifrequency search & classification of the transient radio sky." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:f5a803dd-0e05-4104-be0e-fe221914f1e5.

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The radio sky can exhibit dynamic changes that provide an excellent opportunity to study the most exotic events in the Universe. In recent years the development and completion of advanced radio facilities has enabled the transient radio sky to be probed to unprecedented levels, especially at low frequencies with telescopes such as the Low-Frequency Array (LOFAR) revolutionising observations in this regime. This work primarily focuses on the detection of radio transients both at low and high frequencies. I describe the analysis of a 60 MHz LOFAR monitoring campaign centred at the North Celestia
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5

Tikare, Kiran. "A Close Look at the Transient Sky in a Neighbouring Galaxy." Thesis, Luleå tekniska universitet, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79823.

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Study of the time variable sources and phenomena in Astrophysics provides us with important insights into the stellar evolution, galactic evolution, stellar population studies and cosmological studies such as number density of dark massive objects. Study of these sources and phenomena forms the basis of Time Domain surveys, where the telescopes while scanning the sky regularly for a period of time provides us with positional and temporal data of various Astrophysical sources and phenomena happening in the Universe. Our vantage point within the Milky Way galaxy greatly limits studying our galax
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6

Cruces, Marilyn [Verfasser]. "The Transient Radio Sky: Pulsars and Fast Radio Bursts / Marilyn Cruces." Bonn : Universitäts- und Landesbibliothek Bonn, 2021. http://nbn-resolving.de/urn:nbn:de:hbz:5-63345.

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7

Bell, Martin. "The low frequency array and the transient and variable radio sky." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/208253/.

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This thesis addresses the topic of exploring and characterising the transient and variable radio sky, using both existing radio telescopes, and the next generation of radio facilities such as the Low Frequency Array (LOFAR). Studies of well known variable radio sources are presented in conjunction with blind searches of parameter space for unknown sources. Firstly, a three year campaign to monitor the low luminosity Active Galactic Nucleus NGC 7213 in the radio and X-ray bands is presented. Cross-correlation functions are used to calculate a global time lag between inflow (X-ray) and outflow (
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8

Young, D. R. "Core-collapse supernovae in low-metallicity galaxies and all-sky transient surveys." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517021.

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9

DICHIARA, Simone. "A multiwavelength view of the transient sky: gamma-ray bursts and other fast transients from optical to gamma-rays." Doctoral thesis, Università degli studi di Ferrara, 2015. http://hdl.handle.net/11392/2389002.

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10

Smith, Claire. "I was a Movie, Flashing Transient Pictures Upon a Receptive Sky : Djuna Barnes and the Cinematic." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504016.

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11

MARTONE, RENATO. "A perspective on the high-energy transient sky: from gamma-ray bursts to the search for fast radio burst counterparts." Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2488025.

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My work of thesis focuses on two protagonists of the transient sky, gamma-ray bursts (GRBs) and fast radio bursts (FRBs), tackling both the open issues behind their emission and the technological challenges connected with their observation. In the context of an in-depth understanding of GRBs I studied the popular ”Ep,i–Eiso” correlation. It is fundamental to shed light on the peculiar behaviour of a few events, that appear to be important outliers of the Ep,i–Eiso correlation. In the first part of thesis, I investigate if the locations in the Ep,i/Eiso plane of these bursts may be due to the
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12

Le, Montagner Roman. "High-Energy Transient Universe in the Era of Large Optical Surveys." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP089.

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L'astronomie multi-messagers combine des données de sources variées comme les photons, les ondes gravitationnelles (OG), les neutrinos et les rayons cosmiques. Des avancées significatives ont été réalisées en 1987 avec la détection de neutrinos d'une supernova proche et en 2017 avec la détection conjointe d'OG, d'un sursaut gamma court et d'une kilonova provenant d'une fusion de deux étoiles à neutrons. Ce domaine devrait croître avec le lancement de nouveaux observatoires tels que SVOM, le télescope Einstein, Icecube, KM3Net et l'observatoire Vera C. Rubin. Le Legacy Survey of Space and Time
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13

Botha, Antheun. "Development of a real-time transient analyser for the SKA." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86462.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The extension of the Karoo Array Telescope (KAT), MeerKAT, will be the most sensitive radio telescope in the southern hemisphere until it is superseded by the completion of the Square Kilometre Array (SKA). These instruments are to be constructed in the Karoo which is an area in South-Africa that is protected against Radio Frequency Interference (RFI) by the Astronomy Geographical Advantage (AGA) act. However, the telescope is also vulnerable to self-generated interference and specialised measurement systems are required to mon
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14

Dagoneau, Nicolas. "Détection de sursauts gamma ultra-longs et traitement d'images embarqué pour le télescope spatial SVOM/ECLAIRs." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP040.

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Les sursauts gamma sont des phénomènes extragalactiques brefs, comptant parmi les plus énergétiques de l’Univers et résultant de la formation d’un trou noir stellaire. Ils sont caractérisés par une émission prompte de photons X et gamma, pouvant durer d’une fraction de seconde à quelques minutes, suivis d’une rémanence dans d’autres longueurs d’onde. La mission franco-chinoise SVOM qui est prévue d’entrer en opération après 2021 a pour objectif de détecter leur émission prompte et d’observer leur émission rémanente depuis l’espace et le sol. Le télescope à masque codé ECLAIRs embarqué à bord d
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15

Reyes, Gomez Juan Pablo. "Astronomical image processing from large all-sky photometric surveys for the detection and measurement of type Ia supernovae." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0144.

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Cette thèse présente plusieurs contributions au software developé pour le traitement d’images dans le cadre du LSST. Notre objectif est d'utiliser le code et les algorithmes LSST existants, afin de créer un pipeline dédié à la détection des supernovae de type Ia. Pour la détection des supernovae nous utilisons une technique appelée soustraction optimale d'images qui implique la construction de coadditions. Nous étudions aussi le comportement des différents objets dans le temps et construisons des courbes de lumière qui représentent leur cycle de vie en fonction de l'intensité lumineuse de chaq
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16

Bilarev, Todor. "Feedback Effects in Stochastic Control Problems with Liquidity Frictions." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19592.

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In dieser Arbeit untersuchen wir mathematische Modelle für Finanzmärkte mit einem großen Händler, dessen Handelsaktivitäten transienten Einfluss auf die Preise der Anlagen haben. Zuerst beschäftigen wir uns mit der Frage, wie die Handelserlöse des großen Händlers definiert werden sollen. Wir identifizieren die Erlöse zunächst für absolutstetige Strategien als nichtlineares Integral, in welchem sowohl der Integrand als der Integrator von der Strategie abhängen. Unserere Hauptbeiträge sind hier die Identifizierung der Skorokhod M1 Topologie als geeigneter Topologue auf dem Raum aller Strate
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17

Jencson, Jacob Edmund. "Hunting for Hidden Explosions: Exploring the Transient Infrared Sky with the Spitzer Space Telescope." Thesis, 2020. https://thesis.library.caltech.edu/13617/1/Jencson_Jacob_2020.pdf.

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<p>The study of time-variable astronomical phenomena is undergoing an explosive renaissance ushered in by recent advancements in capabilities to monitor the sky from radio to gamma rays. The infrared region of the electromagnetic spectrum provides a unique window to uncover a vast array of stellar eruptions and explosions that are otherwise obscured; however, the dynamic infrared sky has remained largely unexplored.</p> <p>To uncover these hidden cosmic explosions, I undertook a systematic search in the infrared with the <i>Spitzer Space Telescope</i> called SPIRITS — the SPitzer InfraRed I
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18

Mooley, Kunal Prakash. "Exploring the Dynamic Radio Sky: The Search for Slow Transients with the VLA." Thesis, 2015. https://thesis.library.caltech.edu/8800/1/KunalMooley_25Feb2015_Thesis.pdf.

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While synoptic surveys in the optical and at high energies have revealed a rich discovery phase space of slow transients, a similar yield is still awaited in the radio. Majority of the past blind surveys, carried out with radio interferometers, have suffered from a low yield of slow transients, ambiguous transient classifications, and contamination by false positives. The newly-refurbished Karl G. Jansky Array (Jansky VLA) offers wider bandwidths for accurate RFI excision as well as substantially-improved sensitivity and survey speed compared with the old VLA. The Jansky VLA thus eliminates th
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