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Newly identified extended green objects (EGOs) from the Spitzer GLIMPSE II survey. I. catalog


Chen, X and Gan, C-G and Ellingsen, SP and He, J-H and Shen, Z-Q and Titmarsh, A, Newly identified extended green objects (EGOs) from the Spitzer GLIMPSE II survey. I. catalog, Astrophysical Journal, Supplement Series, 206, (1) Article 9. ISSN 0067-0049 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The American Astronomical Society

DOI: doi:10.1088/0067-0049/206/1/9


We have produced a catalog containing 98 newly identified massive young stellar object (MYSO) candidates associated with ongoing outflows (known as extended green objects, or EGOs). These have been identified from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) II data set and our new identifications increase the number of known EGOs to ~400 in our Galaxy, adding to the ~300 previously identified EGOs reported by Cyganowski et al. from the GLIMPSE I survey. The high detection rate (~70%) of 95 GHz class I methanol masers achieved in a survey toward 57 of these new EGOs with the Mopra 22 m radio telescope demonstrates that the new EGOs are associated with outflows. Investigations of the mid-infrared properties and physical associations with other star formation tracers (e.g., infrared dark clouds, class I and II methanol masers, and millimeter Bolocam Galactic Plane Survey sources) reveal that the newly identified EGOs are very similar in nature to those in the sample of Cyganowski et al. All of the observational evidence supports the hypothesis that EGOs correspond to MYSOs at the earliest evolutionary stage, with ongoing outflow activity, and active rapid accretion.

Item Details

Item Type:Refereed Article
Keywords:infrared, ISM, jets and outflows, radio lines, stars, formation
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:Titmarsh, A (Miss Anita Titmarsh)
ID Code:85124
Year Published:2013
Web of Science® Times Cited:41
Deposited By:Mathematics and Physics
Deposited On:2013-06-14
Last Modified:2017-11-03

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