研究目的
To perform the spectral analysis of the accretion powered millisecond X-ray pulsar SAX J1748.9?2021 during its 2015 outburst using NuSTAR observation data.
研究成果
The spectral analysis of SAX J1748.9?2021 during its 2015 outburst revealed a broad Fe emission line and a Compton hump, successfully modeled with the relxillCP reflection model. The study provided estimates for the disc inclination, inner disc radius, and magnetic field strength at the poles, contributing to the understanding of the source's accretion disc geometry and magnetic field.
研究不足
The study is limited by the constraints of the NuSTAR observation data, including the energy range and the statistical quality of the data above 10 keV. The inner disc radius and magnetic field strength are estimated with upper limits due to these constraints.
1：Experimental Design and Method Selection:
The study utilized the NuSTAR observation data for spectral analysis, employing the self-consistent re?ection model relxillCP to model the reflection spectrum.
2：Sample Selection and Data Sources:
Data was obtained from the NuSTAR observation of SAX J
3：9?2021 during its 2015 outburst. List of Experimental Equipment and Materials:
17 NuSTAR (Nuclear Spectroscopic Telescope Array) was used for the observation.
4：Experimental Procedures and Operational Workflow:
The spectra were analyzed using XSPEC version
5：1m, with interstellar absorption modeled using tbabs. The reflection features were modeled using relxillCP. Data Analysis Methods:
The spectral fitting involved modeling the persistent emission with a combination of a soft thermal component and a thermally Comptonized component, reflected from the disc.
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