Optical and X-ray variations during 5 outbursts of Aql X-1 in 3.6 years from 2016
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917712506126336 |
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| author | Niwano, Masafumi Murata, Katsuhiro L. Ito, Naohiro Yatsu, Yoichi Kawai, Nobuyuki |
| author_facet | Niwano, Masafumi Murata, Katsuhiro L. Ito, Naohiro Yatsu, Yoichi Kawai, Nobuyuki |
| contents | We analyzed optical/X-ray quasi-simultaneous light curves of Aql X-1, obtained by MAXI (Monitor of All-sky X-ray Image), ZTF (Zwicky Transient Facility) and LCO (Las Cumbres Observatory) in about 3.6 years from 2016, for understanding electromagnetic radiation mechanisms during its outbursts. As a result, we confirmed that 5 outbursts had detected in the epoch, and that 3 outbursts underwent the X-ray state transition across Low-Hard, In-Transition, and High-Soft state while remaining 2 outbursts stayed in the Low-Hard state. We found that the optical spectral energy distribution in the High-Soft state is consistent with a simplified irradiated disk model, and that the optical color/magnitude variation can be explained by variations in the X-ray luminosity and the disk geometrical thickness. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_11438 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Optical and X-ray variations during 5 outbursts of Aql X-1 in 3.6 years from 2016 Niwano, Masafumi Murata, Katsuhiro L. Ito, Naohiro Yatsu, Yoichi Kawai, Nobuyuki High Energy Astrophysical Phenomena We analyzed optical/X-ray quasi-simultaneous light curves of Aql X-1, obtained by MAXI (Monitor of All-sky X-ray Image), ZTF (Zwicky Transient Facility) and LCO (Las Cumbres Observatory) in about 3.6 years from 2016, for understanding electromagnetic radiation mechanisms during its outbursts. As a result, we confirmed that 5 outbursts had detected in the epoch, and that 3 outbursts underwent the X-ray state transition across Low-Hard, In-Transition, and High-Soft state while remaining 2 outbursts stayed in the Low-Hard state. We found that the optical spectral energy distribution in the High-Soft state is consistent with a simplified irradiated disk model, and that the optical color/magnitude variation can be explained by variations in the X-ray luminosity and the disk geometrical thickness. |
| title | Optical and X-ray variations during 5 outbursts of Aql X-1 in 3.6 years from 2016 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2308.11438 |