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The environment of the strongest galactic methanol maser

Citation

Sanna, A and Menten, KM and Carrasco-Gonzalez, C and Reid, MJ and Ellingsen, SP and Brunthaler, A and Moscadelli, L and Cesaroni, R and Krishnan, V, The environment of the strongest galactic methanol maser, The Astrophysical Journal Letters, 804, (1) Article L2. ISSN 2041-8205 (2015) [Refereed Article]


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Copyright Statement

Copyright 2015. The American Astronomical Society.

DOI: doi:10.1088/2041-8205/804/1/L2

Abstract

The high-mass star-forming site G009.62+00.20 E hosts the 6.7 GHz methanol maser source with the greatest flux density in the Galaxy which has been flaring periodically over the last 10 yr. We performed high-resolution astrometric measurements of the CH3OH, H2O, and OH maser emission and 7 mm continuum in the region. The radio continuum emission was resolved in two sources separated by 1300 AU. The CH3OH maser cloudlets are distributed along two north–south ridges of emission to the east and west of the strongest radio continuum component. This component likely pinpoints a massive young stellar object which heats up its dusty envelope, providing a constant IR pumping for the Class II CH3OH maser transitions. We suggest that the periodic maser activity may be accounted for by an independent, pulsating, IR radiation field provided by a bloated protostar in the vicinity of the brightest masers. We also report the discovery of an elliptical distribution of CH3OH maser emission in the region of periodic variability.

Item Details

Item Type:Refereed Article
Keywords:SM: kinematics and dynamic, maser, stars: formatio, stars: individual (G009.62+00.20, techniques: high angular resolution
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:Krishnan, V (Mr Vasaant Krishnan)
ID Code:100226
Year Published:2015
Web of Science® Times Cited:10
Deposited By:Mathematics and Physics
Deposited On:2015-05-07
Last Modified:2017-11-03
Downloads:339 View Download Statistics

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