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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2404.11829 |
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| _version_ | 1866914759450820608 |
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| author | Chen, Xiao Ding, Yuanze Wang, Wei Nishimura, Osamu Liu, Qi Zhang, Shuang-Nan Ge, Mingyu Lu, Fangjun Qu, Jinlu Song, Liming Zhang, Shu |
| author_facet | Chen, Xiao Ding, Yuanze Wang, Wei Nishimura, Osamu Liu, Qi Zhang, Shuang-Nan Ge, Mingyu Lu, Fangjun Qu, Jinlu Song, Liming Zhang, Shu |
| contents | Cyclotron resonant scattering features (CRSFs) are the absorption features in the X-ray spectra of strongly magnetized accretion neutron stars (NSs), which are probably the most reliable probe to the surface magnetic fields of NSs. The high mass X-ray binary GX 301--2 exhibits a very wide, variable and complicated CRSF in the average spectra, which should be two absorption lines based on NuStar and Insight-HXMT observations. With the Insight-HXMT frequent observations, we performed the phase-resolved spectroscopy and confirmed two cyclotron absorption lines in the phase-resolved spectra, with their centroid energy ratio $\sim 1.6-1.7$ in the super-critical luminosity case. A major hindrance in understanding those CRSFs is the very poorly constrained magnetic inclination angle, which is also a fundamental property of a NS and key to understanding the emission characteristics of a pulsar. Comparing the phase-resolved CRSF with simulated X-ray spectra, the magnetic inclination angle is found to be $\gtrsim 70^{\circ}$, i.e., nearly orthogonal between the NS's spin and magnetic axies. The implications of an orthogonal rotator and magnetic structure evolution in the accreting X-ray binary are also discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_11829 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for a nearly orthogonal rotator in GX 301--2 with phase-resolved cyclotron resonant scattering features Chen, Xiao Ding, Yuanze Wang, Wei Nishimura, Osamu Liu, Qi Zhang, Shuang-Nan Ge, Mingyu Lu, Fangjun Qu, Jinlu Song, Liming Zhang, Shu High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Cyclotron resonant scattering features (CRSFs) are the absorption features in the X-ray spectra of strongly magnetized accretion neutron stars (NSs), which are probably the most reliable probe to the surface magnetic fields of NSs. The high mass X-ray binary GX 301--2 exhibits a very wide, variable and complicated CRSF in the average spectra, which should be two absorption lines based on NuStar and Insight-HXMT observations. With the Insight-HXMT frequent observations, we performed the phase-resolved spectroscopy and confirmed two cyclotron absorption lines in the phase-resolved spectra, with their centroid energy ratio $\sim 1.6-1.7$ in the super-critical luminosity case. A major hindrance in understanding those CRSFs is the very poorly constrained magnetic inclination angle, which is also a fundamental property of a NS and key to understanding the emission characteristics of a pulsar. Comparing the phase-resolved CRSF with simulated X-ray spectra, the magnetic inclination angle is found to be $\gtrsim 70^{\circ}$, i.e., nearly orthogonal between the NS's spin and magnetic axies. The implications of an orthogonal rotator and magnetic structure evolution in the accreting X-ray binary are also discussed. |
| title | Evidence for a nearly orthogonal rotator in GX 301--2 with phase-resolved cyclotron resonant scattering features |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2404.11829 |