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postgraduate thesis: Gamma-ray spectral analysis of three energetic millisecond pulsars
Title | Gamma-ray spectral analysis of three energetic millisecond pulsars |
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Authors | |
Advisors | Advisor(s):Ng, SCY |
Issue Date | 2018 |
Publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
Citation | Wang, W. [王文超]. (2018). Gamma-ray spectral analysis of three energetic millisecond pulsars. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. |
Abstract | PSRs J0218+4232, B1821−24 and B1937+21 are among the most energetic and fastest-spinning millisecond pulsars (MSPs). They have been studied in radio, X-rays and gamma-rays, and show aligned pulse profiles in all the bands. The Fermi LAT Pass 8 data was published in 2015 and has lots of advantages over the old Pass 7 data, such as increased effective area, wider energy range, and improved event reconstruction. Since the recent gamma-ray spectral anal- yses of the three MSPs are relatively old, I redo the gamma-ray spectral analy- ses of the three MSPs with four-year more Fermi LAT observational data and newly published Fermi LAT Pass 8 data. I obtain better fit results for the gamma-ray spectra of the three MSPs with smaller error bars and larger test statistic values. I also do numerical simulations to test the two-layer model using the new Fermi LAT data. By minimizing the differences between the predictions of the two-layer model and the observational data, I obtain the best-fit values of the three independent parameters of the two-layer model. It is discovered that the simplified two-layer model can predict the broadband spectra of the three MSPs which are very close to the observational data in gamma-rays (Fermi LAT) and X-rays (NuSTAR). |
Degree | Master of Philosophy |
Subject | Gamma ray spectrometry Pulsars |
Dept/Program | Physics |
Persistent Identifier | http://hdl.handle.net/10722/268411 |
DC Field | Value | Language |
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dc.contributor.advisor | Ng, SCY | - |
dc.contributor.author | Wang, Wenchao | - |
dc.contributor.author | 王文超 | - |
dc.date.accessioned | 2019-03-21T01:40:18Z | - |
dc.date.available | 2019-03-21T01:40:18Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Wang, W. [王文超]. (2018). Gamma-ray spectral analysis of three energetic millisecond pulsars. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. | - |
dc.identifier.uri | http://hdl.handle.net/10722/268411 | - |
dc.description.abstract | PSRs J0218+4232, B1821−24 and B1937+21 are among the most energetic and fastest-spinning millisecond pulsars (MSPs). They have been studied in radio, X-rays and gamma-rays, and show aligned pulse profiles in all the bands. The Fermi LAT Pass 8 data was published in 2015 and has lots of advantages over the old Pass 7 data, such as increased effective area, wider energy range, and improved event reconstruction. Since the recent gamma-ray spectral anal- yses of the three MSPs are relatively old, I redo the gamma-ray spectral analy- ses of the three MSPs with four-year more Fermi LAT observational data and newly published Fermi LAT Pass 8 data. I obtain better fit results for the gamma-ray spectra of the three MSPs with smaller error bars and larger test statistic values. I also do numerical simulations to test the two-layer model using the new Fermi LAT data. By minimizing the differences between the predictions of the two-layer model and the observational data, I obtain the best-fit values of the three independent parameters of the two-layer model. It is discovered that the simplified two-layer model can predict the broadband spectra of the three MSPs which are very close to the observational data in gamma-rays (Fermi LAT) and X-rays (NuSTAR). | - |
dc.language | eng | - |
dc.publisher | The University of Hong Kong (Pokfulam, Hong Kong) | - |
dc.relation.ispartof | HKU Theses Online (HKUTO) | - |
dc.rights | The author retains all proprietary rights, (such as patent rights) and the right to use in future works. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject.lcsh | Gamma ray spectrometry | - |
dc.subject.lcsh | Pulsars | - |
dc.title | Gamma-ray spectral analysis of three energetic millisecond pulsars | - |
dc.type | PG_Thesis | - |
dc.description.thesisname | Master of Philosophy | - |
dc.description.thesislevel | Master | - |
dc.description.thesisdiscipline | Physics | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.5353/th_991044091305103414 | - |
dc.date.hkucongregation | 2019 | - |
dc.identifier.mmsid | 991044091305103414 | - |