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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2312.16937 |
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| _version_ | 1866916185366331392 |
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| author | Xiao, Hua Ji, Long Zhang, Peng Ducci, Lorenzo Doroshenko, Victor Santangelo, Andrea Zhang, Shu Zhang, Shuang-Nan |
| author_facet | Xiao, Hua Ji, Long Zhang, Peng Ducci, Lorenzo Doroshenko, Victor Santangelo, Andrea Zhang, Shu Zhang, Shuang-Nan |
| contents | We report timing and spectral studies of the high mass X-ray binary 4U 1700-37 using Insight-HXMT observations carried out in 2020 during its out-of-eclipse state. We found significant variations in flux on a time-scale of kilo-seconds, while the hardness (count rate ratio between 10-30 keV and 2-10 keV) remains relatively stable. No evident pulsations were found over a frequency range of $10^{-3}$-2000 Hz. During the spectral analysis, for the first time we took the configuration of different Insight-HXMT detectors' orientations into account, which allows us obtaining reliable results even if a stable contamination exists in the field-of-view. We found that the spectrum could be well described by some phenomenological models that commonly used in accreting pulsars (e.g., a power law with a high energy cutoff) in the energy range of 2-100 keV. We found hints of cyclotron absorption features around ~ 16 keV or/and ~ 50 keV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_16937 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Timing and Spectral Analysis of HMXB 4U 1700-37 Observed with Insight-HXMT Xiao, Hua Ji, Long Zhang, Peng Ducci, Lorenzo Doroshenko, Victor Santangelo, Andrea Zhang, Shu Zhang, Shuang-Nan High Energy Astrophysical Phenomena We report timing and spectral studies of the high mass X-ray binary 4U 1700-37 using Insight-HXMT observations carried out in 2020 during its out-of-eclipse state. We found significant variations in flux on a time-scale of kilo-seconds, while the hardness (count rate ratio between 10-30 keV and 2-10 keV) remains relatively stable. No evident pulsations were found over a frequency range of $10^{-3}$-2000 Hz. During the spectral analysis, for the first time we took the configuration of different Insight-HXMT detectors' orientations into account, which allows us obtaining reliable results even if a stable contamination exists in the field-of-view. We found that the spectrum could be well described by some phenomenological models that commonly used in accreting pulsars (e.g., a power law with a high energy cutoff) in the energy range of 2-100 keV. We found hints of cyclotron absorption features around ~ 16 keV or/and ~ 50 keV. |
| title | Timing and Spectral Analysis of HMXB 4U 1700-37 Observed with Insight-HXMT |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2312.16937 |