Insights from the Gaussian Processes Method for the FRB-associated X-ray Burst of SGR 1935+2154
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909227634655232 |
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| author | Tang, Ruijing Yan, Dahai Zhang, Haiyun Zhao, Qingchang Tao, Lian Li, Chengkui Ge, Mingyu Li, Xiaobo Yin, Qianqing Cai, Ce |
| author_facet | Tang, Ruijing Yan, Dahai Zhang, Haiyun Zhao, Qingchang Tao, Lian Li, Chengkui Ge, Mingyu Li, Xiaobo Yin, Qianqing Cai, Ce |
| contents | Gaussian processes method is employed to analyze the light curves of bursts detected by Insight-HXMT, NICER, and GECAM from SGR 1935+2154 between 2020 to 2022. It is found that a stochastically driven damped simple harmonic oscillator (SHO) is necessary to capture the characteristics of the X-ray bursts. Variability timescale of the X-ray bursts, corresponding to the broken frequencies in the SHO power spectral densities (PSDs), are extracted. In particular, a high broken frequency of 35 Hz where the index of the SHO PSD changes from -4 to -2 is constrained by the HXMT-HE burst associated with FRB 200428. It is suggested that the corresponding timescale of 0.03 s could be the retarding timescale of the system driven by some energy release, and the production of the HE photon should be quasi-simultaneous with the response. The other special event is a NICER burst with a retarding timescale of 1/39 Hz (0.02 s). In the normal X-ray bursts, no retarding timescale is constrained; a long relax/equilibrium timescale (corresponding to a broken frequency of 1-10 Hz where the index of the SHO PSD changing from -4/-2 to 0 in the SHO PSD) is obtained. The results indicate that the FRB-associated HXMT-HE X-ray burst could be produced immediately when the system is responding to the energy disturbance, far before the equilibrium state. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_12976 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Insights from the Gaussian Processes Method for the FRB-associated X-ray Burst of SGR 1935+2154 Tang, Ruijing Yan, Dahai Zhang, Haiyun Zhao, Qingchang Tao, Lian Li, Chengkui Ge, Mingyu Li, Xiaobo Yin, Qianqing Cai, Ce High Energy Astrophysical Phenomena 85-02 Gaussian processes method is employed to analyze the light curves of bursts detected by Insight-HXMT, NICER, and GECAM from SGR 1935+2154 between 2020 to 2022. It is found that a stochastically driven damped simple harmonic oscillator (SHO) is necessary to capture the characteristics of the X-ray bursts. Variability timescale of the X-ray bursts, corresponding to the broken frequencies in the SHO power spectral densities (PSDs), are extracted. In particular, a high broken frequency of 35 Hz where the index of the SHO PSD changes from -4 to -2 is constrained by the HXMT-HE burst associated with FRB 200428. It is suggested that the corresponding timescale of 0.03 s could be the retarding timescale of the system driven by some energy release, and the production of the HE photon should be quasi-simultaneous with the response. The other special event is a NICER burst with a retarding timescale of 1/39 Hz (0.02 s). In the normal X-ray bursts, no retarding timescale is constrained; a long relax/equilibrium timescale (corresponding to a broken frequency of 1-10 Hz where the index of the SHO PSD changing from -4/-2 to 0 in the SHO PSD) is obtained. The results indicate that the FRB-associated HXMT-HE X-ray burst could be produced immediately when the system is responding to the energy disturbance, far before the equilibrium state. |
| title | Insights from the Gaussian Processes Method for the FRB-associated X-ray Burst of SGR 1935+2154 |
| topic | High Energy Astrophysical Phenomena 85-02 |
| url | https://arxiv.org/abs/2404.12976 |