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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 |
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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 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: | 18 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2015-05-07 |
Last Modified: | 2017-11-03 |
Downloads: | 394 View Download Statistics |
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