A Class I and Class II Methanol Maser Survey of Extended Green Objects (EGOs) from the GLIMPSE Survey
C.J. Cyganowski, C.L. Brogan, T.R. Hunter, E. Churchwell

TL;DR
This study uses high-resolution VLA observations to survey methanol masers in EGOs, revealing high detection rates of outflow and YSO indicators, confirming EGOs as young, active massive stellar objects.
Contribution
It provides the first high-resolution survey of Class I and II methanol masers in EGOs, demonstrating their association with active outflows and young massive stars.
Findings
High detection rate (>64%) of Class II methanol masers in EGOs.
Approximately 89% of EGOs with Class II masers also have Class I masers.
High SiO detection rate (90%) indicating active outflows.
Abstract
We present the results of a high angular resolution Very Large Array (VLA) Class I 44 GHz and Class II 6.7 GHz methanol maser survey of a sample of ~20 massive young stellar object (MYSO) outflow candidates selected on the basis of extended 4.5 micron emission in Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) images. These 4.5 micron-selected candidates are referred to as extended green objects (EGOs), for the common coding of this band as green in three-color IRAC images. The detection rate of 6.7 GHz Class II methanol masers, which are associated exclusively with massive YSOs, towards EGOs is greater than ~64%--nearly double the detection rate of surveys using other MYSO selection criteria. The detection rate of Class I 44 GHz methanol masers, which trace molecular outflows, is ~89% towards EGOs associated with 6.7 GHz methanol masers. The two types of…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Galaxies: Formation, Evolution, Phenomena
