The bicoherence analysis of type C quasi-periodic oscillations in Swift J1727.8-1613
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929479271579648 |
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| author | Zhu, Haifan Wang, Wei Zhu, Ziyuan |
| author_facet | Zhu, Haifan Wang, Wei Zhu, Ziyuan |
| contents | We present the results of bicoherence analysis for Swift J1727.8-1613 during its 2023 outburst, using data from Insight-HXMT. Our analysis focused on observations with quasi-periodic oscillations (QPOs) of frequencies greater than 1 Hz, revealing that all of them belong to type C QPOs. We found a strong correlation between the QPO frequency and the hardness ratio, as well as a linear relationship between the QPO RMS and the hardness ratio. The bicoherence analysis revealed a transition from a "web" pattern to a "hypotenuse" pattern in the LE and HE energy bands. In the bicoherence patterns, there are correlations between horizontal and vertical bicoherence at $f_1=f_2=f_{\rm QPO}$ with count rates. The diagonal structure at $f_1+f_2=f_{\rm QPO}$ becomes more prominent with increasing energy. Additionally, we discovered a new bicoherence pattern in the medium energy band from 10 -- 20 keV, the diagonal structure at $f_1+f_2=f_{\rm har}$ is prominent only in this energy band, which we refer to as the "parallel" pattern. The bicoherence analysis indicates that the source is likely a low-inclination source. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_17039 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The bicoherence analysis of type C quasi-periodic oscillations in Swift J1727.8-1613 Zhu, Haifan Wang, Wei Zhu, Ziyuan High Energy Astrophysical Phenomena We present the results of bicoherence analysis for Swift J1727.8-1613 during its 2023 outburst, using data from Insight-HXMT. Our analysis focused on observations with quasi-periodic oscillations (QPOs) of frequencies greater than 1 Hz, revealing that all of them belong to type C QPOs. We found a strong correlation between the QPO frequency and the hardness ratio, as well as a linear relationship between the QPO RMS and the hardness ratio. The bicoherence analysis revealed a transition from a "web" pattern to a "hypotenuse" pattern in the LE and HE energy bands. In the bicoherence patterns, there are correlations between horizontal and vertical bicoherence at $f_1=f_2=f_{\rm QPO}$ with count rates. The diagonal structure at $f_1+f_2=f_{\rm QPO}$ becomes more prominent with increasing energy. Additionally, we discovered a new bicoherence pattern in the medium energy band from 10 -- 20 keV, the diagonal structure at $f_1+f_2=f_{\rm har}$ is prominent only in this energy band, which we refer to as the "parallel" pattern. The bicoherence analysis indicates that the source is likely a low-inclination source. |
| title | The bicoherence analysis of type C quasi-periodic oscillations in Swift J1727.8-1613 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.17039 |