The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23-00.50

Abstract

We detected flaring flux variability that regularly occurred with the period of 23.9 days on a 6.7 GHz methanol maser emission at Vlsr = 25.30 km/s in G 014.23-00.50 through highly frequent monitoring using the Hitachi 32-m radio telescope. By analyzing data from 05 January 2013 to 21 January 2016, the periodic variability has persisted in at least 47 cycles, corresponding to approximately 1,100 days. The period of 23.9 days is the shortest one observed in masers at around high-mass young stellar objects so far. The flaring component normally falls below the detection limit (3 sigma) of 0.9 Jy. In the flaring periods, the component rises above the detection limit with the ratio of the peak flux density more than 180 in comparison with a quiescent phase, showing intermittent periodic variability. The time-scale of the flux rise was typically two days or shorter, and both symmetric and asymmetric profiles of flux variability were observed through intraday monitoring. These characteristics might be explained by a change in the flux of seed photons by a colliding-wind binary (CWB) system or a variation of the dust temperature by an extra heating source of a shock formed by the CWB system within a gap region in a circumbinary disk, in which the orbital semi-major axes of the binary are 0.26-0.34 au.

12 pages, 9 figures, 2 tables, accepted for publication in PASJ

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Cited by in corpus (13)

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• 6.7 GHz variability characteristics of new periodic methanol maser sources
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• New evidence for Dicke's superradiance in the 6.7 GHz methanol spectral line in the interstellar medium
• A search for radio jets from massive young stellar objects. Association of radio jets with H2O and CH3OH masers
• A New 3D Maser Code Applied to Flaring Events
• Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
• Periodic variability of the mainline hydroxyl masers in G9.62+0.20E
• Detection of the longest periodic variability in 6.7 GHz methanol masers G5.900-0.430
• WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects
• Massive Protocluster of a Periodic Maser Source G188.95+0.89
• Mid-Infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.09
• On the pumping of the CS($v=0$) masers in W51 e2e