Discovery of periodic class II methanol masers associated with G339.986-0.425 region

Abstract

Ten new class II methanol masers from the 6.7-GHz Methanol Multibeam survey catalogues III and IV were selected for a monitoring programme at both 6.7 and 12.2 GHz with the 26m Hartebeesthoek Radio Astronomy Observatory (HartRAO) radio telescope for two years and nine months, from August 2012 to May 2015. In the sample, only masers associated with G339.986-0.425 were found to show periodic variability at both 6.7 and 12.2 GHz. The existence of periodic variation was tested with four independent methods. The analytical method gave the best estimation of the period, which was 246 $\pm$ 1 days. The time series of G339.986-0.425 show strong correlations across velocity channels and between the 6.7 and 12.2 GHz masers. The time delay was also measured across channels and shows structure across the spectrum which is continuous between different maser components.

arXiv comment13 pages, 18 figures, 4 tables, accepted for publication in MNRAS. The appendix of 6 pages (with 22 figures) will be published as online version

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• 6.7 GHz variability characteristics of new periodic methanol maser sources
• Long-term multi-frequency maser observations of the intermediate-mass young stellar object G107.298+5.639
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• Long-term Variability of H${}_2$CO Masers in Star-forming Regions
• Detection of the longest periodic variability in 6.7 GHz methanol masers G5.900-0.430
• Massive Protocluster of a Periodic Maser Source G188.95+0.89
• Discovery of recurrent flares of 6.7 GHz methanol maser emission in Cepheus A HW2