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A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt

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Description:This dissertation, "A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt" by 梁寶, Po, Leung, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled A MONTE CARLO STUDY OF THE STATISTICAL PROPERTIES OF GAMMA-RAY PULSARS IN THE GOULD BELT submitted by Leung Po for the Degree of Master of Philosophy at The University of Hong Kong in August 2003 In this project, a study was made of the outer-gap size, -ray luminosity and death lines of -ray emission from pulsars with outer gaps. When the geometry of the dipole magnetic ﬁeld is taken into account, the derived outer gap size is a function of period (P), magnetic ﬁeld (B) of the neutron star and the average radial distance to the neutron star, which depends on the magnetic inclination angle ((R)). The fractional size of the outer gap, f(P;B; ((R))), was used to describe the thickness of the outer gap and was determined by the electron-positron pair production. The outer gap will not exist if f(r;(R)) > 1. In estimating the fractional size of the outer gap, two possible X-ray ﬁeldswere considered: (i) X-rays produced by the neutron star cooling and polar cap heating, and (ii)X-rays produced by the bombardment of the relativistic particles from the outer gap on the stellar surface (the outer gap is assumed to beself-sustained). Forall-raypulsarswithself-sustainedoutergapssimulated by using Monte Carlo methods, -ray luminosity L satisﬁes L / L; where sd thevalueof dependsonthesensitivityofthe-raydetector. FortheEnergetic Gamma Ray Experiment Telescope (EGRET), is 0:38 whereas is 0:46 for the Gamma Ray Large Area Space Telescope (GLAST). For -ray pulsars crit crit 34 1=3 1 with L - L, is 1. L = 1:5 10 P erg is determined by sd sd sd f( r ) = 1. These results are roughly consistent with the observed luminosity of -ray pulsars. Further, the death lines of the pulsars with outer gaps in the two possible X-ray ﬁelds were given and a comparison made with the observed data. In addition, -ray emission properties of pulsars were investigated by using a new self-consistent outer-gap model. The outer gap can exist in pulsars with age up to 310 years, if their magnetic inclination angles are suﬃciently large. Themature-raypulsars, whoseagesarebetween1to3millionyears, are abletomoveuptohighgalacticlatitude. Moreover, their-rayluminositiesare weakerandtheirspectraaremuchsofterthanthoseofyoung-raypulsarswith ages periods (0.1-0.8)s, for j b j> 5 . A comparison was made of model spatial, energy-ﬂux distributions and log N-log S for mature -ray pulsars with those unidentiﬁed sources at medium latitude detected by EGRET. It was concluded thattheseunidentiﬁedsourcesatmediumlatitudebelongtothisclassofmature-ray pulsars. Furthermore, the relation between -ray luminosity L and the spin-down power L for this group of pulsars satisﬁes L / L instead of sd sd L / L for -ray pulsars in the galactic plane, where 1 and 0:4 sd respectively. DOI: 10.5353/th_b2666531 Subjects: Gamma raysPulsarsMonte Carlo methodWe have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt. To get started finding A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt, you are right to find our website which has a comprehensive collection of manuals listed.
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Description: This dissertation, "A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt" by 梁寶, Po, Leung, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled A MONTE CARLO STUDY OF THE STATISTICAL PROPERTIES OF GAMMA-RAY PULSARS IN THE GOULD BELT submitted by Leung Po for the Degree of Master of Philosophy at The University of Hong Kong in August 2003 In this project, a study was made of the outer-gap size, -ray luminosity and death lines of -ray emission from pulsars with outer gaps. When the geometry of the dipole magnetic ﬁeld is taken into account, the derived outer gap size is a function of period (P), magnetic ﬁeld (B) of the neutron star and the average radial distance to the neutron star, which depends on the magnetic inclination angle ((R)). The fractional size of the outer gap, f(P;B; ((R))), was used to describe the thickness of the outer gap and was determined by the electron-positron pair production. The outer gap will not exist if f(r;(R)) > 1. In estimating the fractional size of the outer gap, two possible X-ray ﬁeldswere considered: (i) X-rays produced by the neutron star cooling and polar cap heating, and (ii)X-rays produced by the bombardment of the relativistic particles from the outer gap on the stellar surface (the outer gap is assumed to beself-sustained). Forall-raypulsarswithself-sustainedoutergapssimulated by using Monte Carlo methods, -ray luminosity L satisﬁes L / L; where sd thevalueof dependsonthesensitivityofthe-raydetector. FortheEnergetic Gamma Ray Experiment Telescope (EGRET), is 0:38 whereas is 0:46 for the Gamma Ray Large Area Space Telescope (GLAST). For -ray pulsars crit crit 34 1=3 1 with L - L, is 1. L = 1:5 10 P erg is determined by sd sd sd f( r ) = 1. These results are roughly consistent with the observed luminosity of -ray pulsars. Further, the death lines of the pulsars with outer gaps in the two possible X-ray ﬁelds were given and a comparison made with the observed data. In addition, -ray emission properties of pulsars were investigated by using a new self-consistent outer-gap model. The outer gap can exist in pulsars with age up to 310 years, if their magnetic inclination angles are suﬃciently large. Themature-raypulsars, whoseagesarebetween1to3millionyears, are abletomoveuptohighgalacticlatitude. Moreover, their-rayluminositiesare weakerandtheirspectraaremuchsofterthanthoseofyoung-raypulsarswith ages periods (0.1-0.8)s, for j b j> 5 . A comparison was made of model spatial, energy-ﬂux distributions and log N-log S for mature -ray pulsars with those unidentiﬁed sources at medium latitude detected by EGRET. It was concluded thattheseunidentiﬁedsourcesatmediumlatitudebelongtothisclassofmature-ray pulsars. Furthermore, the relation between -ray luminosity L and the spin-down power L for this group of pulsars satisﬁes L / L instead of sd sd L / L for -ray pulsars in the galactic plane, where 1 and 0:4 sd respectively. DOI: 10.5353/th_b2666531 Subjects: Gamma raysPulsarsMonte Carlo methodWe have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt. To get started finding A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt

A Monte Carlo Study of the Statistical Properties of Gamma-ray Pulsars in the Gould Belt

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