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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.11815 |
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| _version_ | 1866910373046648832 |
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| author | Shui, Qingcang Zhang, Shu Wang, Pengju Mushtukov, Alexander Santangelo, Andrea Zhang, Shuangnan Kong, Lingda Ji, Long Chen, Yupeng Doroshenko, Victor Frontera, Fillipo Chang, Zhi Peng, Jingqiang Yin, Hongxing Qu, Jinlu Tao, Lian Ge, Mingyu Li, Jian Ye, Wentao Li, Panping |
| author_facet | Shui, Qingcang Zhang, Shu Wang, Pengju Mushtukov, Alexander Santangelo, Andrea Zhang, Shuangnan Kong, Lingda Ji, Long Chen, Yupeng Doroshenko, Victor Frontera, Fillipo Chang, Zhi Peng, Jingqiang Yin, Hongxing Qu, Jinlu Tao, Lian Ge, Mingyu Li, Jian Ye, Wentao Li, Panping |
| contents | We present a detailed analysis of the X-ray luminosity (Lx) dependence of the cyclotron absorption line energy (Ecyc) for the X-ray binary pulsar 1A 0535+262 during its 2020 giant outburst based on pulse-to-pulse analysis. By applying this technique to high cadence observations of Insight-HXMT, we reveal the most comprehensive Ecyc-Lx correlation across a broad luminosity range of ~(0.03-1.3)*10^38 erg/s. Apart from the positive and negative correlations between cyclotron line energy and luminosity at Lx~(1-3)*10^37 erg/s and ~(7-13)*10^37 erg/s, which are expected from the typical subcritical and supercritical accretion regimes, respectively, a plateau in the correlation is also detected at ~(3-7)*10^37 erg/s^-1. Moreover, at the lowest luminosity level (Lx<10^37 erg/s), the positive Ecyc-Lx correlation seems to be broken, and the pulse profile also occurs a significant transition. These discoveries provide the first complete view on the correlation between luminosity and the centriod energy of the cyclotron line, and therefore are relevant for understanding how accretion onto magnetized neutron stars depends on luminosity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_11815 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cyclotron line evolution revealed with pulse-to-pulse analysis in the 2020 outburst of 1A 0535+262 Shui, Qingcang Zhang, Shu Wang, Pengju Mushtukov, Alexander Santangelo, Andrea Zhang, Shuangnan Kong, Lingda Ji, Long Chen, Yupeng Doroshenko, Victor Frontera, Fillipo Chang, Zhi Peng, Jingqiang Yin, Hongxing Qu, Jinlu Tao, Lian Ge, Mingyu Li, Jian Ye, Wentao Li, Panping High Energy Astrophysical Phenomena We present a detailed analysis of the X-ray luminosity (Lx) dependence of the cyclotron absorption line energy (Ecyc) for the X-ray binary pulsar 1A 0535+262 during its 2020 giant outburst based on pulse-to-pulse analysis. By applying this technique to high cadence observations of Insight-HXMT, we reveal the most comprehensive Ecyc-Lx correlation across a broad luminosity range of ~(0.03-1.3)*10^38 erg/s. Apart from the positive and negative correlations between cyclotron line energy and luminosity at Lx~(1-3)*10^37 erg/s and ~(7-13)*10^37 erg/s, which are expected from the typical subcritical and supercritical accretion regimes, respectively, a plateau in the correlation is also detected at ~(3-7)*10^37 erg/s^-1. Moreover, at the lowest luminosity level (Lx<10^37 erg/s), the positive Ecyc-Lx correlation seems to be broken, and the pulse profile also occurs a significant transition. These discoveries provide the first complete view on the correlation between luminosity and the centriod energy of the cyclotron line, and therefore are relevant for understanding how accretion onto magnetized neutron stars depends on luminosity. |
| title | Cyclotron line evolution revealed with pulse-to-pulse analysis in the 2020 outburst of 1A 0535+262 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2403.11815 |