论文标题
在6.7 GHz甲醇masers G45.804-0.356和G49.043-1.079中检测周期性耀斑
Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
论文作者
论文摘要
背景：6.7 GHz甲醇Maser源的周期性是在长期监测计划中发现的一种罕见现象。了解导致定期可变性的基本过程可能会提供对高质量恒星形成区域的物理过程的见解。目的：我们旨在识别和描述新的周期性甲醇果酱。方法：观察结果是用Torun 32M天线获得的。时间序列分析是使用已有良好的统计方法进行的。此外，使用Neowise数据来搜索红外和Maser通量之间的相关性。结果：我们发现了两个新的周期来源，G45.804-0.356和G49.043-1.079，分别为416.9和469.3天。对于G49.043-1.079，红外变异性与甲醇耀斑同时。结论：G49.043-1.079的周期性最有可能的原因是调制积聚。对于G45.804-0.356，无法使用可用数据来解释周期性，并且需要进一步的研究。
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.
