Journal Article

Class I methanol masers: masers with extended green objects

X. Chen, S. P. Ellingsen and Z.–Q. Shen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1603-1609
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2009.14818.x
Class I methanol masers: masers with extended green objects

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We have compared the results of a number of published class I methanol maser surveys with the catalogue of high–mass outflow candidates identified from the Galactic Legacy Infrared Mid–Plane Survey Extraordinaire survey (known as extended green objects or EGOs). We find class I methanol masers associated with approximately two–thirds of EGOs. Although the association between outflows and class I methanol masers has long been postulated on the basis of detailed studies of a small number of sources, this result demonstrates the relationship for the first time on a statistical basis. Despite the publication of a number of searches for class I methanol masers, a close physical association with another astrophysical object which could be targeted for the search is still lacking. The close association between class I methanol masers and EGOs therefore provides a large catalogue of candidate sources, most of which have not previously been searched for class I methanol masers. Interstellar masers and outflows have both been proposed to trace an evolutionary sequence for high–mass star formation, therefore a better understanding of the relationship between class I methanol masers and outflow offers the potential for comparison and amalgamation of these two evolutionary sequences.

Keywords: masers; stars: formation; ISM: molecules; infrared: ISM; radio lines: ISM

Journal Article.  5028 words. 

Subjects: Astronomy and Astrophysics

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