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Dissertations / Theses on the topic 'Pulsares'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Coelho, Jaziel Goulart. "Magnetares e os pulsares de anãs brancas." Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2854.

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Os Pulsares Anômalos de Raios-X (AXPs) e Repetidores de Raios-gama moles (SGRs) são alguns dos grupos mais interessantes de pulsares que têm sido intensivamente estudados nos últimos anos. Eles são entendidos como estrelas de nêutrons (ENs) com campos magnéticos super fortes ($Bgtrsim10^{14}$) G. No entanto, nos últimos dois anos duas SGRs com baixos campos magnéticos $ Bsim(10^{12}-10^{13})$ G foram detectadas. Além disso, três anãs brancas (ABs) muito rápidas e {it magnéticas} também foram observadas recentemente. Com base nestes novos pulsares descobertos, podemos comparar e contrastar os

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2

Oliveira, Heitor Oliveira de. "Modelo para o índice de frenagem de pulsares." Instituto Tecnológico de Aeronáutica, 2015. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3276.

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Pulsares são objetos astrofísicos normalmente modelados como estrelas de nêutrons compactas, tendo como origem o colapso de outra estrela. Em um modelo que chamaremos canônico, supõe-se que os pulsares são descritos por corpos extremamente massivos e esféricos que giram em torno de si mesmos, compostos por um dipolo magnético cujo o eixo magnético via de regra se encontra desalinhado com o eixo de rotação. Esse desalinhamento seria responsável pela observação de radiação emitida em intervalos de tempo bem definidos em uma dada orientação (efeito farol), que é a característica observacional típ

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3

Lobato, Ronaldo Vieira. "Emissão de rádio nas magnetares e pulsares de anãs brancas." Instituto Tecnológico de Aeronáutica, 2015. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3196.

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Recentemente, foi proposto um modelo alternativo baseado em pulsares de anãs brancas para os repetidores de raios gama moles (SGRs) e os pulsares de raio-X anômalos (AXPs) (Malheiro, 2012), designados normalmente como magnetares. Neste modelo as anãs brancas magnéticas podem ter campos magnéticos $Bsim 10^{7}-10^{10} { m G}$ e rodarem muito rápido em frequências $Omegasim 1 { m rad/s}$, permitindo que produzam grandes diferenças de potencial eletromagnéticos (EM) e gerar pares de elétrons-pósitrons ($e^{pm}$). Estes potenciais EM são comparáveis com os produzidos em pulsares de estrelas de nêu

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4

Martín, Rodríguez Jonatan. "Theory & observations of the PWN-SNR complex." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283894.

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In this work, we study theoretical and observational issues about pulsars (PSRs), pulsar wind nebulae (PWNe) and supernova remnants (SNRs). In particular, the spectral modeling of young PWNe and the X-ray analysis of SNRs with magnetars comparing their characteristics with those remnants surrounding canonical pulsars. The spectra of PWNe range from radio to γ-rays. They are the largest class of identified Galactic in γ-rays increasing the number from 1 to ∼30 during the last years. We have developed a detailed spectral code which reproduces the electromagnetic spectrum of PWNe in free e

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5

Lin, Tingting. "Pulsar Wind Nebulae: observations and models of 3C58 and discovery of superefficiency." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671177.

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Aquesta tesi està centrada en l’estudi de les nebuloses produïdes pel vent dels pulsars (acrònim anglès, PWNe), que es formen com a resultat de que la major part de l’energia rotacional del púlsar es perd per l’emissió d’un vent relativista de partícules. Els vents, supersònics respecte al medi interestel·lar, produeixen un xoc terminal on les partícules s’acceleren. Atès que la nebulosa conté fotons i camps magnètics, les partícules poden emetre a totes les freqüències, des de ràdio fins a energies TeV, mitjançant processos no tèrmics com el sincrotró i el Compton invers. Aquesta tesi estudi

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6

Galindo, Fernández Daniel. "Study of the extreme gamma-ray emission from Supernova Remnants and the Crab Pulsar." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663414.

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In our Galaxy, supernova remnants and pulsars are the two most numerous populations of non-thermal objects. The goal of this thesis is to study the extreme gamma-ray emission from these two astrophysical objects with Fermi -LAT and MAGIC. In particular, supernova remnants Cassiopeia A and SNR G24.7+0.6 and the Crab pulsar. Cassiopeia A, one of the historical supernova remnants and the prime candidate of its class to be a PeVatron accelerator, has been discarded as so since we provided the first measurement of a turn-off in the gamma-ray spectrum at 3 TeV, implying the emission ob

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7

Livingstone, Margaret Anne. "Timing young pulsars: challenges to standard pulsar spin-down models." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=94909.

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Pulsars are rapidly rotating neutron stars which are often noted for their very regular rotation rates. Young pulsars however, frequently exhibit two types of deviations from steady spin down, ``glitches'' - sudden jumps in spin frequency, which provide insight into pulsar interiors, and ``timing noise,'' a smooth stochastic wander of the pulse phase over long time periods. The youngest pulsars also offer a window into the physics that govern pulsar spin down via the measurement of the "braking index'' - a parameter that relates the observable spin frequency of the pulsar with the slowing dow

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8

Lopes, Caio Vinicius Costa. "Resposta não linear do vácuo a distribuições de correntes na ausência de um campo externo de fundo e suas aplicações a pulsares e estrelas de quarks." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07102014-143531/.

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Nesta dissertação de mestrado, nós encontramos a correção não linear aos campos elétrico e magnético produzidos por distribuições de cargas estacionárias, como o monopolo elétrico e o dipolo magnético homogeneamente polarizado em repouso, no vácuo, ou seja, imersas em um campo externo de fundo nulo. A função de resposta não linear é dada pelo tensor de polarização de quarta ordem, devido ao espalhamento de dois fótons, e é escrita dentro da aproximação da ação efetiva em eletrodinâmica quântica. Como aplicações realizamos estimativas numéricas para a correção dos campos produzidos em pulsares

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9

Moreno, de la Cita Víctor. "Coupling fluid-dynamics and non-thermal processes to study sources of high-energy emission." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/403843.

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In this thesis we have developed a tool for the computation of non-thermal emission in astrophysical sources. The code reads the hydrodynamic data coming from relativistic hydrodynamic simulations and compute the injection, evolution and radiation of non-thermal particles. The emission channels explored in the thesis are mainly Inverse Compton (IC) and synchrotron. Making use of this tools, we have studied the following sources: Star-jet interactions in agn Some galaxies with an Active Galactic Nucleus (AGN) present two jets of relativistic particles. The pressence of this jets is linked w

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10

Desvignes, Grégory. "L'observation des pulsars au Radiotélescope de Nançay : applications à la recherche de nouveaux objets, à l'étude des systèmes binaires relativistes et à la détection d'un fond d'ondes gravitationnelles." Phd thesis, Université d'Orléans, 2009. http://tel.archives-ouvertes.fr/tel-00496806.

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Un pulsar est une étoile à neutrons en rotation rapide et dotée d'un fort champ magnétique qui peut se manifester en émettant sur tout le spectre électromagnétique. Dans cette thèse, je m'intéresse au rayonnement radio produit par l'étoile. Je commence ainsi par décrire l'instrumentation de dédispersion cohérente à base de GPUs installée au Radiotélescope de Nançay avec deux autres modes d'observation que j'ai développés : un mode pour la recherche de nouveaux pulsar et un mode spectromètre. Une autre partie de ce travail détaille le retraitement en cours du sondage Foster fait à la fin des an

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11

Octau, Franck. "Exploration d'un grand relevé à Nançay et diversité de la population de pulsars." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2042/document.

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Depuis la découverte du premier pulsar en 1967, nous connaissons désormais plus de 2500 pulsars aujourd’hui. Les pulsars offrent un champ d’études considérable : depuis l’étude des propriétés du milieu interstellaire et l’étude de la magnétosphère des pulsars jusqu’aux tests de la gravité en champ fort et la caractérisation d’un fond d’ondes gravitationnelles d’origine cosmologique. Cela explique pourquoi nous continuons de chercher de nouveaux pulsars de nos jours. Après des découvertes de pulsars millisecondes dans les sources non identifiées du Fermi Large Area Telescope, un programme de re

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12

Cameron, Andrew [Verfasser]. "Innovative Pulsar Searching Techniques : or Fantastic Pulsars and How to Find Them / Andrew Cameron." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1162953063/34.

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13

Gabbanelli, Luciano. "Analysis of some classical and quantum aspects of black holes." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668189.

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For ninety years we have known that our universe is in expansion. Cosmological data favor an unknown form of intrinsic and fundamental uniform energy contributing approximately 68% of the total energy budget in the current epoch. The simplest proposal in accordance with observations is the standard cosmological model consisting of a small but positive cosmological constant producing a gravitational repulsive effect driving the accelerated expansion. In standard cosmology general relativity is assumed as the theory for gravity, which in turn predicts that a sufficiently compact mass can deform

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14

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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15

Venter, Christo. "Millisecond pulsars and pulsar wind nebulae as sources of gamma rays and cosmic rays / C. Venter." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2067.

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16

Jacoby, Bryan Anthony Hillenbrand Lynne A. "Recycled pulsars /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-01272005-015012.

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17

Brook, Paul Richard. "The variability of radio pulsars." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:65ae413c-cd12-408b-843c-60886cecf1b7.

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Neutron stars are amongst the most exotic objects known in the universe; more than a solar mass of material is squeezed into an object the size of a city, leading to a density comparable to that of an atomic nucleus. They have a surface magnetic field which is typically around a trillion times stronger than the magnetic field here on Earth, and we have observed them to spin up to around 700 times per second. The existence of neutron stars was first proposed by Baade and Zwicky in 1934 but later graduated from theory to fact in 1967 as the first pulses were detected by Jocelyn Bell-Burnell, a t

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18

Bondonneau, Louis. "Première caractérisation de la population de pulsars radio à basses fréquences avec NenuFAR." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3032.

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Un pulsar est une étoile à neutrons en rotation rapide (typiquement un tour par seconde) dont le faisceau d’émission radio provenant des pôles magnétiques de l'étoile balaie l’univers. Quand le faisceau intercepte la Terre, le pulsar est détectable comme une série de pulsations régulières dans dans un vaste domaine de longueurs d'onde, de la radio jusqu'aux rayons gamma. Au cours de cette thèse j’ai utilisé, adapté et développé des méthodes d'analyses ainsi qu'un pipeline de traitement de signal en temps réel afin d’étudier les signaux radio des pulsars dans la gamme des basses fréquences util

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19

Guillemot, Lucas. "Détections de pulsars milliseconde avec le FERMI Large Area Telescope." Phd thesis, Bordeaux 1, 2009. http://tel.archives-ouvertes.fr/tel-00432706.

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Le satellite Fermi a été lancé le 11 juin 2008, avec à son bord le Large Area Telescope (LAT). Le LAT est un télescope sensible au rayonnement gamma de 20 MeV à plus de 300 GeV. Au début de l'activité de Fermi, neuf pulsars jeunes et énergétiques étaient connus dans le domaine gamma. Le nombre de détections de pulsars par le LAT prédit avant lancement était de plusieurs dizaines au moins. Le LAT permettait également l'étude des pulsars milliseconde (MSPs), jamais détectés avec certitude à très haute énergie jusqu'alors. Cette thèse aborde dans un premier temps la campagne de chronométrie des p

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20

Edwards, Russell T. "Pulsar searching /." Australian Digital Theses Program, 2001. http://adt.lib.swin.edu.au/public/adt-VSWT20050323.141044.

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Thesis (Ph.d.) - Swinburne University of Technology, 2001.<br>Submitted for the degree of Doctor of Philosophy, Swinburne University of Technology, 2001. Typescript. Includes bibliographical references (p. 122-131).

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21

Icdem, Burcin. "Viscous Time Scale In Accreting Powered Pulsars And Anomalous X-ray Pulsars." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613373/index.pdf.

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In this thesis we analyse X-ray data of accretion powered low mass and high mass X-ray binaries to understand the nature of their accretion mechanisms by searching for some clues of viscous time-scales of their accretion discs, if they have, in their low frequency power density spectra created from their long-term X-ray observations, or by doing pulse timing analysis with much shorter X-ray data to detect the effects of torque fluctuations caused by the accreting material on the pulsar. The low mass and high mass X-ray binaries we analysed have breaks in their power density spectra, which are

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22

Sanwal, Divas. "Optical study of pulsars /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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23

Herfindal, Jeffrey. "Nulling Periodicities in Pulsars." ScholarWorks @ UVM, 2008. http://scholarworks.uvm.edu/graddis/108.

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Numerous studies of conal pulsars, e.g. B1133+16, have revealed fluctuation features and a steady null fraction. Sensitive Arecibo observations provide an unprecedented ability to detect nulls and confirm previously found fluctuation features. By replacing each pulse with a scaled version of the average profile, we were able to quench all subpulse modulation, dubbed pulse-modulation quelling (PMQ). It was surprising to note that the low-frequency feature observed in the natural longitude resolved fluctuation spectra (LRF) persisted in the PMQ LRFs! It appears that we can conclude, then,

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Hassall, Tom. "Observing pulsars with LOFAR." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/observing-pulsars-with-lofar(1860a120-1c7a-4d64-a281-f482f3f53614).html.

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The LOw Frequency ARray (LOFAR) is the first of a new generation of telescopes which, instead of using a single large dish, will combine the signals from thousands of antennas. Combining these signals creates a virtual beam, which can be 'pointed' like traditional (dish-like) telescopes, but with significantly improved angular resolution and sensitivity at low frequencies. This unique configuration also allows LOFAR to observe in several modes which are not possible with other telescopes, including forming multiple beams, and simultaneously taking imaging and beam-formed data. In this thesis w

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Spir-Jacob, Marion. "Observation et détection de pulsars avec les télescopes gamma H.E.S.S. et phénoménologie d'une nouvelle composante spectrales pulsée atteignant 20 TeV." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7169.

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La thèse porte sur la recherche avec le réseau de télescopes H.E.S.S. de pulsations en rayons gamma en provenance de pulsars.Une première partie est dédiée à l’étude de tests statistiques de périodicité à base de simulations Monte Carlo, notamment dans un régime de basse statistique et/ou de faible rapport signal sur bruit. Dans une deuxième partie, ces tests sont utilisés dans l’analyse des données de H.E.S.S. du pulsar de Vela et de deux autres pulsars, PSR B1706-44 et PSR J1509-5850. Les pulsations de Vela ont un spectre très dur et sont observées aux énergies allant de 3 TeV jusqu’au-delà

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Chrétien, Mathieu. "Détection du pulsar de Vela et recherche de violation d'invariance de Lorentz avec le cinquième télescope de H.E.S.S." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066362/document.

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Le cinquième télescope (CT5) du réseau H.E.S.S. (High Energy Stereoscopic System) a été inauguré en 2012. H.E.S.S. est destiné à l’observation du ciel austral dans le domaine des rayons γ et CT5, dont le seuil est d’environ 30 GeV, a permis la détection du pulsar de Vela après 24 heures d’observations. Certains scénarios de gravitation quantique (QG) prédisent une violation d’invariance de Lorentz (LIV). Celle-ci se manifeste par l’ajout de termes ∝(E/EQG)n aux relations de dispersion du photon, où E est l’énergie du quanta de lumière, EQG l’énergie caractéristique des processus de QG et n l’o

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Larroche, Olivier. "Mécanismes de rayonnement des pulsars." Phd thesis, Université Paris Sud - Paris XI, 1987. http://tel.archives-ouvertes.fr/tel-00785857.

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On étudie, du point de vue théorique ainsi que par des simulations numériques, l'instabilité vis-à-vis du rayonnement de courbure d'un faisceau de particules chargées guidées par un très fort champ magnétique courbé, qui est intéressante en tant que mécanisme de rayonnement radio des pulsars. Les conditions de croissance sont un gradient de densité assez raide sur la frontière extérieure du faisceau et des fréquences élevées, satisfaisant une condition non-WKB.

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Breton, René. "Radio pulsars in binary systems." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40755.

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This thesis focuses on the study of binary radio pulsars, their evolution and some specific use of their properties to investigate fundamental physics such as general relativity and other gravitational theories. The work that we present here is organized in three main parts. First, we report on the study of PSR J1744-3922, a binary pulsar presenting a peculiar `flickering' flux behavior as well as spin and orbital properties that do not correspond to the expectations of standard evolution scenarios. We investigated the nature of this flux behavior. We also studied the pulsar's properties in r

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Brazler, Karen Tracy Susan. "TeV astronomy of millisecond pulsars." Thesis, Durham University, 1991. http://etheses.dur.ac.uk/5971/.

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This thesis is concerned with the detection of pulsed TeV γ-rays from millisecond pulsars. These stars appear to include some very efficient producers of high energy particles, but the mechanisms by which they produce TeV γ-rays are still a matter of debate. After an introductory section, there is a brief description of the principles used in the atmospheric Cerenkov technique. The design and operation of the University of Durham atmospheric Cerenkov telescopes are reviewed. The main analysis techniques used to search for periodic signals are then described. The effects on periodic signals of

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Larroche, Olivier. "Mécanismes de rayonnement des pulsars." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37607032p.

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Kiel, Paul Douglas. "Populating the galaxy with pulsars." Swinburne Research Bank, 2009. http://hdl.handle.net/1959.3/64888.

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Thesis (Ph.D) - Swinburne University of Technology, Faculty of Information & Communication Technologies, 2009.<br>A dissertation presented in fulfillment of the requirements for the degree of Doctor of Philosophy, [Faculty of Information and Communication Technologies], Swinburne University of Technology, 2009. Typescript. Bibliography: p. 207-223.

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Smedley, Sarah Louise. "Formation of binary millisecond pulsars." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709132.

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Jussila, Adam P. "Simulating Pulsar Signal Scattering in the Interstellar Medium with Two Distinct Scattering Phenomena." Oberlin College Honors Theses / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1528814998720461.

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Grondin, Marie-hélène. "Premières détections de nébuleuses avec le Fermi-Large Area Telescope et étude de leurs pulsars." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14039/document.

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Dédié à l’étude de l’astronomie gamma, le satellite Fermi a été lancé le 11 juin 2008. Il comporte à sonbord l’instrument Large Area Telescope (LAT), sensible au rayonnement gamma dans la gamme d’énergie de20 MeV à 300 GeV. Bien que la nébuleuse du Crabe ait été étudiée dans la gamme d’énergie 70 MeV à 30GeV couverte par son précédesseur, l’expérience CGRO-EGRET, aucune nébuleuse n’a jamais été clairementidentiﬁée dans le domaine des rayons gamma de haute énergie jusqu’au lancement de Fermi.Les pulsars alimentent les nébuleuses qui les entourent par l’injection permanente d’un vent d’électrons

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Lassus, Antoine. "Méthode de détection de sources individuelles d'ondes gravitationnelles par chronométrie d'un réseau de pulsars : application aux données de l'EPTA." Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-01017215.

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L'existence des ondes gravitationnelles, fluctuations de l'espace-temps lui-même, a été prédite sans, pour l'instant, qu'une détection directe n'ait été encore possible. A l'heure actuelle, des méthodes consistant en des détecteurs interférométriques de plusieurs kilomètres de long sont à l'oeuvre pour permettre une première détection. Nous proposons, dans cette thèse, d'étudier une autre méthode : la chronométrie d'un réseau de pulsars milliseconde. Elle consiste en l'observation régulière et la datation précise des impulsions radio en provenance de pulsars ultrastables. L'onde gravitationnel

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Ferdman, Robert Daniel. "Binary pulsars: evolution and fundamental physics." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/370.

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In the standard theory of pulsar spin-up, a neutron star (NS) in a binary system accretes matter from its companion star; this serves to transfer angular momentum to the NS, increasing the spin frequency of the pulsar. Measurement of the orbital parameters and system geometry, and in particular the final system masses, thus provide important constraints for theories regarding binary evolution. We present results from an investigation of three binary pulsar systems. PSR J1802-2124 is in an intermediate-mass pulsar binary system with a massive white dwarf companion in a compact orbit with a peri

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Kasian, Laura Elizabeth. "Radio observations of two binary pulsars." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/41515.

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The study of pulsars in binary systems produces a wide variety of scientific results, including unique tests of general relativity and constraints on the equation of state of matter at extremely high densities. Through pulsar timing (which utilizes the fact that pulsars are precise clocks), it is possible to precisely measure the orbital parameters and masses of some binary pulsars, which can place constraints on their mass transfer histories. We present timing results for two binary pulsars. The intermediate-mass binary pulsar (IMBP) PSR J0621+1002 is a mildly recycled pulsar in an 8.3-day

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Nespoli, Elisa. "Multiwavelength study of accretion-powered pulsars." Doctoral thesis, Universitat de València, 2010. http://hdl.handle.net/10803/41717.

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My PhD thesis consists in a multi-frequency approach to High Mass X-ray Binaries (HMXBs), using infrared and X-ray data. On one side, my research project aimed at the identification and characterization of IR counterparts to obscured HMXBs in the Scutum and Norma inner galactic arms. The identification of optical/IR counterparts to HMXBs is a necessary step to undertake detailed studies of these systems. With data limited to the high-energy range, the understanding of their complex structure and dynamics cannot be complete. In the last years, INTEGRAL has revealed the presence of an importan

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Wu, Man-ho, and 胡文浩. "High-energy radiation from millisecond pulsars." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193484.

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As the successor of the Energetic Gamma Ray Experiment Telescope, the Large Area Telescope on board the Fermi Gamma-ray Space Telescope has measured the pulsations from over a hundred pulsars, a rapidly growing population in the gamma-ray sky. Pulsars spinning as fast as a few to ten milliseconds, the millisecond pulsars (MSPs), constitute over 30% of the population, with most of which found in binary systems. Many MSPs are found to have low-mass companions with masses less than ~ 0:1 of that of the Sun. Observations reveal that in these systems, the companion is irradiated by the radiation an

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Nieder, Lars [Verfasser]. "Binary Gamma-ray Pulsars / Lars Nieder." Hannover : Gottfried Wilhelm Leibniz Universität, 2020. http://d-nb.info/1229615091/34.

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Lyutikov, Maxim Blandford Roger D. "Coherent emission mechanisms in radio pulsars /." Diss., Pasadena, Calif. : California Institute of Technology, 1998. http://resolver.caltech.edu/CaltechETD:etd-09232008-092435.

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Lyon, Robert James. "Why are pulsars hard to find?" Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/why-are-pulsars-hard-to-find(f15226ec-355d-4794-b2b8-e0a8e793948e).html.

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Searches for pulsars during the past fifty years, have been characterised by two problems making their discovery difficult: i) an increasing volume of data to be searched, and ii) an increasing number of `candidate' pulsar detections arising from that data, requiring analysis. Whilst almost all are caused by noise or interference, these are often indistinguishable from real pulsar detections. Deciding which candidates should be studied is therefore difficult. Indeed it has become known as the `candidate selection problem'. This thesis presents an interdisciplinary study of the selection proble

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Taris, François. "Pulsars millisecondes et métrologie du temps." Observatoire de Paris (1667-....), 1996. https://hal.science/tel-02095273.

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Après avoir été définie et réalisée au cours des siècles par les astronomes, la mesure du temps est devenue, en 1964, la responsabilité des physiciens qui, grâce aux horloges atomiques, fabriquent des références de temps extrêmement stables et génèrent l'unité de temps du système international. Cependant, après la découverte en 1982 par Backer des pulsars millisecondes, il apparut que la mesure du temps pourrait redevenir une affaire d'astronomes. La stabilité à long terme de ces pulsars et en particulier de PSR1937+21 semblait en effet équivalente et même meilleure que celle des meilleures ho

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Petri, Jérôme. "Structure électromagnétique globale autour des pulsars." Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR16233.

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Pancrazi, Benoît. "Étude multilongueur d'onde des pulsars milliseconde." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1525/.

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Les pulsars milliseconde (MSPs) sont des étoiles à neutrons caractérisées par une période de rotation de l'ordre de la milliseconde. Ils sont très probablement accélérés (recyclés) dans des systèmes binaires par transfert de moment cinétique lors d'une phase d'accrétion. A l'image des pulsars normaux, les MSPs sont principalement détectés et observés dans le domaine radio, mais des observations récentes à haute énergie ont montré que certains objets sont également sources de rayons X et gamma. Néanmoins, la question de l'origine de l'émission de haute énergie des MSPs est toujours ouverte. Mal

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Gill, Colin D. "Searching for gravitational waves from pulsars." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3754/.

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The work presented here looks at several aspects of searching for continuous gravitational waves from pulsars, often referred to simply as continuous waves or CWs. This begins with an examination of noise in the current generation of laser interferometer gravitational wave detectors in the region below ~100 Hz. This frequency region is of particular interest with regards to CW detection as two prime sources for a first CW detection, the Crab and Vela pulsars, are expected to emit CWs in this frequency range. The Crab pulsar's frequency lies very close to a strong noise line due to the 60 Hz ma

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Espinoza, Cristobal Manuel. "The rotational history of young pulsars." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508978.

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張益軍 and Yijun Zhang. "Pulsar statistics in our galaxy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31225585.

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Lundgren, Scott Campbell. "A multi-wavelength study of rotation-driven pulsars." Arecibo, Puerto Rico ; Ithaca, N.Y. : National Astronomy and Ionospheric Center, Arecibo Observatory, 1994. http://catalog.hathitrust.org/api/volumes/oclc/29573307.html.

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Jia, Jianjun. "The phase-resolved spectra of the crab pulsar." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36379918.

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