A 78- and 96- minute quasi-periodic gamma-ray oscillations in Sagittarius A*
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913702492504064 |
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| author | Magallanes-Guijón, Gustavo Mendoza, Sergio |
| author_facet | Magallanes-Guijón, Gustavo Mendoza, Sergio |
| contents | Using publicly available gamma-rays data from the Fermi satellite and the Fermitools package, we constructed 867-day light curves of Sagittarius A* to search for potential periodicities from 2008 to 2024. By applying statistical and computational inference methods, we used periodograms, a window function, unsupervised machine learning (K-Means), the Markov Chain Monte Carlo method, noise colour analysis, and phase-folding techniques. Additionally, the datasets were fitted with a Jacobi elliptical function using a likelihood approach. In total, 1,463,040 minutes were analysed. This analysis revealed a significant period of enhanced activity lasting ~78 minutes, followed by a quiescent phase of about ~18 minutes, resulting in a total quasi-periodic oscillation (QPO) of around 96 minutes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_05875 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A 78- and 96- minute quasi-periodic gamma-ray oscillations in Sagittarius A* Magallanes-Guijón, Gustavo Mendoza, Sergio High Energy Astrophysical Phenomena Using publicly available gamma-rays data from the Fermi satellite and the Fermitools package, we constructed 867-day light curves of Sagittarius A* to search for potential periodicities from 2008 to 2024. By applying statistical and computational inference methods, we used periodograms, a window function, unsupervised machine learning (K-Means), the Markov Chain Monte Carlo method, noise colour analysis, and phase-folding techniques. Additionally, the datasets were fitted with a Jacobi elliptical function using a likelihood approach. In total, 1,463,040 minutes were analysed. This analysis revealed a significant period of enhanced activity lasting ~78 minutes, followed by a quiescent phase of about ~18 minutes, resulting in a total quasi-periodic oscillation (QPO) of around 96 minutes. |
| title | A 78- and 96- minute quasi-periodic gamma-ray oscillations in Sagittarius A* |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.05875 |