Spectral Evolution of Hercules X-1 over Main High State from RXTE/PCA Observations  

作　　者：Denis A. Leahy Mohammed H. Abdallah Denis A. Leahy;Mohammed H. Abdallah(Department of Physics and Astronomy, University of Calgary, Calgary, Canada;Astronomy Department, National Research Institute of Astronomy and Geophysics (NRIAG), Cairo, Egypt)

机构地区：[1]Department of Physics and Astronomy, University of Calgary, Calgary, Canada [2]Astronomy Department, National Research Institute of Astronomy and Geophysics (NRIAG), Cairo, Egypt

出　　处：《Journal of High Energy Physics, Gravitation and Cosmology》2022年第4期896-918,共23页高能物理（英文）

摘　　要：We test different X-ray spectrum models to find the one that best represents the observed Rossi X-ray Timing Explore/Proportional Counter Array (RXTE /PCA) spectra of Her X-1 during Main High state (MH). We then apply this model to MH observations taken over the lifetime of RXTE. From the results, we obtain patterns in the spectral parameters vs. 35-day phase during MH. The precessing-disc occultation model explains the 35-day cycle by changes in observer view of the emission regions by the accretion disc 35-day precession. Qualitatively, we find that this model can describe the main spectral changes. However, several spectral parameters show detailed changes that the models have not addressed yet. These changes will likely require modifications to the basic precessing-disc model for the 35-day cycle.We test different X-ray spectrum models to find the one that best represents the observed Rossi X-ray Timing Explore/Proportional Counter Array (RXTE /PCA) spectra of Her X-1 during Main High state (MH). We then apply this model to MH observations taken over the lifetime of RXTE. From the results, we obtain patterns in the spectral parameters vs. 35-day phase during MH. The precessing-disc occultation model explains the 35-day cycle by changes in observer view of the emission regions by the accretion disc 35-day precession. Qualitatively, we find that this model can describe the main spectral changes. However, several spectral parameters show detailed changes that the models have not addressed yet. These changes will likely require modifications to the basic precessing-disc model for the 35-day cycle.

关 键 词：X-Ray Binaries Hercules X-1 X-Ray Spectrum 

分 类 号：G63[文化科学—教育学]