Polarization Perspectives on Hercules X-1: Further Constraining the Geometry
We conduct a comprehensive analysis of the accreting X-ray pulsar, Hercules X-1, utilizing data from IXPE and NuSTAR. IXPE performed five observations of Her X-1, consisting of three in the Main-on state and two in the Short-on state. Our time-resolved analysis uncovers the linear correlations betwe...
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| creator | Zhao, Qingchang Li, Hancheng Lian Tao Feng, Hua Zhang, Shuangnan Walter, Roland Ge, Mingyu Tong, Hao Long, Ji Zhang, Liang Qu, Jinlu Huang, Yue Ma, Xiang Zhang, Shu Yin, Qianqing Yin, Hongxing Ma, Ruican Zhao, Shujie Li, Panping Yang, Zixu Liu, Hexin Yu, Wei Huang, Yiming Li, Zexi Li, Yajun Xiao, Jingyu Zhao, Kang |
| description | We conduct a comprehensive analysis of the accreting X-ray pulsar, Hercules X-1, utilizing data from IXPE and NuSTAR. IXPE performed five observations of Her X-1, consisting of three in the Main-on state and two in the Short-on state. Our time-resolved analysis uncovers the linear correlations between the flux and polarization degree as well as the pulse fraction and polarization degree. Geometry parameters are rigorously constrained by fitting the phase-resolved modulations of Cyclotron Resonance Scattering Feature and polarization angle with a simple dipole model and Rotating Vector Model respectively, yielding roughly consistent results. The changes of \(\chi_{\rm p}\) (the position angle of the pulsar's spin axis on the plane of the sky) between different Main-on observations suggest the possible forced precession of the neutron star crust. Furthermore, a linear association between the energy of Cyclotron Resonance Scattering Feature and polarization angle implies the prevalence of a dominant dipole magnetic field, and their phase-resolved modulations likely arise from viewing angle effects. |
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IXPE performed five observations of Her X-1, consisting of three in the Main-on state and two in the Short-on state. Our time-resolved analysis uncovers the linear correlations between the flux and polarization degree as well as the pulse fraction and polarization degree. Geometry parameters are rigorously constrained by fitting the phase-resolved modulations of Cyclotron Resonance Scattering Feature and polarization angle with a simple dipole model and Rotating Vector Model respectively, yielding roughly consistent results. The changes of \(\chi_{\rm p}\) (the position angle of the pulsar's spin axis on the plane of the sky) between different Main-on observations suggest the possible forced precession of the neutron star crust. 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| subjects | Cyclotron resonance Dipoles Neutron stars Polarization Pulsars Resonance scattering |
| title | Polarization Perspectives on Hercules X-1: Further Constraining the Geometry |
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