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Showing 1 to 20 of 89 for “"pulsar"”.
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Probes of pulsar emission physics: The double pulsar and the gamma-ray pulsar population
The double pulsar, PSR J0737-3039A/B, is a unique binary system in which both neutron stars have been detected as radio pulsars. We analyze the evolution of the radio emission from the second born, 2.8 s pulsar (pulsar B) based on five years of Green Bank Telescope data since 2003 December. We find …
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Pulsar electrodynamics
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-16T18:32:38Z No. of bitstreams: 1 1973_hinata.pdf: 2136245 bytes, checksum: 8f19035226b5013b4234cb2f7df7b678 (MD5)
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Multidisciplinary studies of pulsar data and applications to Pulsar Timinig Arrays
Pulsars are fast-rotating, highly-magnetized neutron stars, visible at radio wavelenghts as pulsating obje ts thanks to two beams of emission that are fo ussed on the magneti poles and o-rotate with the star, the rotational axis of whi h is not aligned with the magneti one. The rotational stability …
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Plasma processes in pulsar environments
… effects and collective plasma processes in pulsar environments. Pulsars are one of the most enigmatic objects in the universe. Formed in supernova explosions, pulsars are rapidly rotating neutron stars identified by their periodically pulsed electromagnetic emission. The source of the …
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Pulsar wind nebulae at high energies
Pulsar wind nebulae (PWNe) are the most abundant TeV gamma-ray emitters in the Milky Way. The radiative emission of these objects is powered by fast-rotating pulsars, which donate parts of their rotational energy into winds of relativistic particles. This thesis presents an in-depth study of the …
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New Treatment Of The Pulsar Equation
In solving the pulsar equation, two methods have risen to the forefront, the CKF method (Contopoulos, Kazanas, and Fendt), and the TOTS method (Takamori, Okawa, Takamoto, and Suwa). Both methods are implemented by numerical relaxation, which creates problems at a singular surface known as the light …
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Theoretical studies of the pulsar magnetosphere
… a rotating. magnetized. neutron star (pulsar) are studied in this thesis. Both the aligned model (rotation axis parallel to magnetic axis) and the nonaligned model are considered. An energy analysis is performed on two explicit models of the aligned rotator due to Jackson. The unknown …
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Exploiting pulsar timing at low radio frequencies: applications to Pulsar Timing Arrays, Interstellar medium and HII regions
Pulsar timing at low radio frequencies offers a powerful way to investigate chromatic propagation effects in the ionised interstellar medium and to refine the modelling of noise processes in Pulsar Timing Array (PTA) analyses. A central element of this thesis is the combination of observations from …
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Tests of Gravity Theories with Pulsar Timing
Pulsars are the most precise and stable macroscopic clocks in nature. With spinning periods of only a few milliseconds and timescales of the order of years, these astrophysical clocks can easily compete with the best atomic clocks on earth. The fast rotation of the pulsars induces through the …
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Properties and Geometry of Radio Pulsar Emission
Contains fulltext : 29816.pdf (Publisher’s version ) (Open Access) Contains fulltext : 36190.pdf (Publisher’s version ) (Open Access)
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Motion of charged particles in pulsar magnetospheres
The motion of charges in the magnetosphere of pulsars is studied from two complementary points of view: (i) For the case of aligned magnetic and rotational axes we solve a fluid version of the Lorentz-Dirac equation, in the Landau approximation, for a two-component plasma. We start from an …
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Mathematical methods for radio pulsar searching and applications
… specifically those used to search for radio pulsar signals in radio astronomical data. These algorithms are notoriously computationally extremely expensive, so we will also discuss their implementation on modern high-performance-computing systems, as well as possible ways to improve their …
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Towards a holographic description of pulsar glitch mechanism
… in understanding the underlining physics of pulsar glitches: beginning from the pedagogical development of the subject to eventually motivating the use of AdS/CFT techniques in studying a certain class of condensed matter systems. The foundation of this work is built upon the Gross Pitaevskii …
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A study of vortex lattices and pulsar glitches
… in order to explain and predict the behavior of pulsar glitches.
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Dispersion measure variations in pulsar observations with LOFAR
… of the dispersion measure (DM) variations for 68 pulsars. The observations were taken using six International LOFAR Stations in Europe over the period of 3.5 years (between June 2014 and November 2017) at the centre frequency of 150 MHz with 80 MHz of bandwidth. During this time each pulsar was …
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Towards detecting gravitational waves from the Crab Pulsar
… to the 59.7 Hz radiation frequency of the Crab pulsar. Application of the techniques developed in this work to the LIGO detectors promises to improve the signal to noise ratio at the Crab frequency and thus pave the way toward direct detection of gravitational radiation from a known source.
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Studying the southerly eclipsing millisecond pulsar J1748-2446A using MeerKAT
… of PSR J1748-2446A, a millisecond pulsar in an ablating binary system, as its pulses pass through the companion star's outflow material. To conduct this analysis we used two observations from the South African MeerKAT telescope at L-band frequencies. As PSR J1748-2446A transitions …
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Luminosity functions consistent with a pulsar-dominated Galactic Center Excess
A new population of millisecond pulsars is a long-standing proposed explanation for the excess of GeV-scale gamma rays emanating from the region surrounding the center of the Milky Way (the “Galactic Center excess”). We examine several simple parameterizations of possible luminosity functions for …
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