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

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...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2011-09
Main Authors: Fujisawa, Kenta, Sugiyama, Koichiro, Aoki, Nozomu, Hirota, Tomoya, Mochizuki, Nanako, Doi, Akihiro, Honma, Mareki, Kobayashi, Hideyuki, Kawaguchi, Noriyuki, Ogawa, Hideo, Omodaka, Toshihiro, Yonekura, Yoshinori
Format: Article
Language:English
Subjects:
Bursting
Flux density
Masers
Massive stars
Methanol
Spatial distribution
Star & galaxy formation
Star formation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1109.2429