Bursting Activity in a High-Mass Star-Forming Region G33.64-0.21 Observed with the 6.7 GHz Methanol Maser

Abstract

We report the detection of bursts of 6.7 GHz methanol maser emission in a high-mass star-forming region, G33.64-0.21. One of the spectral components of the maser in this source changed its flux density by 7 times that of the previous day, and it decayed with a timescale of 5 days. The burst occurred repeatedly in the spectral component, and no other components showed such variability. A VLBI observation with the Japanese VLBI Network (JVN) showed that the burst location was at the southwest edge of a spatial distribution, and the bursting phenomenon occurred in a region much smaller than 70 AU. We suggest an impulsive energy release like a stellar flare as a possible mechanism for the burst. These results imply that 6.7 GHz methanol masers could be a useful new probe for studying bursting activity in the process of star formation of high-mass YSOs with a high-resolution of AU scale.

6 pages, 4 figures, accepted for publication in PASJ

References in corpus (5)

• Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408
• A new probe of magnetic fields during high-mass star formation: Zeeman splitting of 6.7 GHz methanol masers
• Synchrotron emission from the T Tauri binary system V773 Tau A
• Periodic variability of 6.7GHz methanol masers in G22.357+0.066
• VLA observations of water masers towards 6.7 GHz methanol maser sources

Cited by in corpus (11)

• The Extraordinary Outburst in the Massive Protostellar System NGC6334I-MM1: Emergence of Strong 6.7 GHz Methanol Masers
• A Galactic survey of radio jets from massive protostars
• Periodic Flare of the 6.7 GHz Methanol Maser in IRAS22198+6336
• The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23-00.50
• Explaining fast radio bursts through Dicke's superradiance
• Explaining Recurring Maser Flares in the ISM Through Large-scale Entangled Quantum Mechanical States
• 6.7GHz methanol maser variability in Cepheus A
• 6.7 GHz variability characteristics of new periodic methanol maser sources
• Observations of the Bursting Activity of the 6.7GHz Methanol Maser in G33.641-0.228
• New evidence for Dicke's superradiance in the 6.7 GHz methanol spectral line in the interstellar medium
• Observations of 12.2 GHz methanol masers towards northern high-mass protostellar objects