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 13 of 13 for “"millisecond pulsars"”.
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Gamma-ray emission from Galactic millisecond pulsars: Implications for dark matter indirect detection
… In the meantime, a population of unresolved millisecond pulsars (MSPs) in the Galactic center remains a possible source of the excess. Furthermore, recent analyses have shown that the excess prefers the spatial morphology of the stellar bulge distribution in the Galactic center, supporting a …
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A spectroscopic and photometric study of MSP companions in Galactic Globular Clusters
… to the study of the optical companions of Millisecond Pulsars in Galactic Globular Clusters (GCs) as a part of a large project started at the Department of Astronomy of the Bologna University, in collaboration with other institutions (Astronomical Observatory of Cagliari and Bologna, …
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A search for fast pulsars in globular clusters
Millisecond pulsars (MSP) are old neutron stars that have been spun up to high spin frequencies(as fast as 716 Hz) through the accretion of matter from a companion star. The extreme stellar densities in the core of globular clusters creates numerous accreting neutron star systems through exchange …
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Listening to the Universe through indirect detection
… likely to be associated with a population of millisecond pulsars. Yet these pulsars were completely unanticipated, and highlight that indirect detection can lead to many new insights about the universe, hopefully one day including the particle nature of dark matter.
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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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The X-ray and gamma-ray sky - Temporal, spectral and triangulation techniques for the characterization and localization of sources in High Energy Astrophysics
… Black Hole Transient in a hard state. Accreting Millisecond X-ray Pulsars (AMXPs) are a subclass of NS LMXBs in which the NS shows X-ray pulsations at periods shorter than 10 milliseconds. In these systems, the X-ray emission comes from accretion of matter at the magnetic poles, modulated at the …
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Search and characterization of pulsars in southern globular clusters: new methodologies and results from an S-band survey
This thesis explores the search for radio pulsars in globular clusters and the development of computational methods to enhance their detection under challenging observational conditions. Pulsars are rapidly rotating neutron stars---remnants of supernova explosions---and represent some of the most …
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Very old and very young compact objects : X-ray studies of galactic globular clusters and recent core-collapse supernovae
… radio data, and another was found to be a millisecond pulsar. Of the remaining sources, I expect that 2-4 are background objects and that the rest are either CVs or millisecond pulsars whose radio emission has not been detected. These and other Chandra results on globular clusters indicate …
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Formation of Low-Mass X-Ray Binaries
… naturally leads to the formation of the binary millisecond pulsars in very-long-period orbits.
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X-ray timing of the accreting millisecond pulsar SAX J1808.4-3658
… y = -0.47 to -0.70. The three other accreting millisecond pulsars that we analyzed, XTE J0929-314, XTE J1814-338, and HETE J1900.1-2455, do not as fully explore a wide range of fluxes, but they too seem to obey a similar relation. We argue that these trends may be evidence of the recession of …
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The analysis and interpretation of VHE (Eg > 1 TeV gamma ray measurements
… Existing models for r-ray emission from isolated pulsars are investigated with the aim of predicting the VHE r-ray luminosity. It is found that only millisecond pulsars can produce observable VHE polar cap r-rays while an outer gap near the light cylinder can provide observable VHE r-rays from …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… 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 are fast-spinning neutron stars that emit radio beams from their magnetic poles. In spite of over 40 …
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Accretion- and nuclear-powered phenomena in neutron stars with millisecond spin periods
… produced by accreting neutron stars with millisecond spin periods can provide important information about the masses M and radii R of neutron stars, thereby yielding uniquely valuable information about the still uncertain properties of cold matter at several times the density of nuclear …