Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
| Autor: | Olech, Mateusz, Durjasz, Michał, Szymczak, Marian, Bartkiewicz, Anna |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | A&A 661, A114 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202243108 |
| Popis: | Context: Periodicity in 6.7 GHz methanol maser sources is a rare phenomenon that was discovered during long-term monitoring programmes. Understanding the underlying processes that lead to periodic variability might provide insights into the physical processes in high-mass star-forming regions. Aims: We aim to identify and describe new periodic methanol masers. Methods: The observations were obtained with the Torun 32m antenna. Time series analysis was conducted using well-proven statistical methods. Additionally, NEOWISE data were used to search for a correlation between infrared and maser fluxes. Results: We found two new periodic sources, G45.804-0.356 and G49.043-1.079, with periods of 416.9 and 469.3 days, respectively. For G49.043-1.079, infrared variability is simultaneous with methanol flares. Conclusions: A most likely cause of the periodicity in G49.043-1.079 is modulated accretion. For G45.804-0.356, the periodicity cannot be explained with the available data, and further research is needed. Comment: 8 pages, 5 figures |
| Databáze: | arXiv |
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