Detection of periodic flares in 6.7 GHz methanol masers G45.804−0.356 and G49.043−1.079
Abstract
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 32 m 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2022
- DOI:
- 10.1051/0004-6361/202243108
- arXiv:
- arXiv:2203.10859
- Bibcode:
- 2022A&A...661A.114O
- Keywords:
-
- masers;
- stars: formation;
- ISM: clouds;
- radio lines: ISM;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 8 pages, 5 figures