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Masers in GLIMPSE Extended Green Objects (EGOs)

Published online by Cambridge University Press:  24 July 2012

Claudia J. Cyganowski
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138USANSF Astronomy and Astrophysics Postdoctoral Fellow email: ccyganowski@cfa.harvard.edu
Crystal L. Brogan
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA 22902USA
Todd R. Hunter
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA 22902USA
Ed Churchwell
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI, 53706, USA
Jin Koda
Affiliation:
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA
Erik Rosolowsky
Affiliation:
Department of Physics and Astronomy, University of British Columbia, Okanagan, Kelowna BC, Canada
Sarah Towers
Affiliation:
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA
Barb Whitney
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI, 53706, USA
Qizhou Zhang
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138USA
Corresponding
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Abstract

Large-scale Spitzer surveys of the Galactic plane have yielded a new diagnostic for massive young stellar objects (MYSOs) that are actively accreting and driving outflows: extended emission in the IRAC 4.5 μm band, believed to trace shocked molecular gas. Maser studies of these extended 4.5 μm sources (called EGOs, Extended Green Objects, for the common coding of 3-color IRAC images) have been and remain crucial for understanding the nature of EGOs. High detection rates in VLA CH3OH maser surveys provided the first proof that EGOs were indeed MYSOs driving outflows; our recent Nobeyama 45-m survey of northern EGOs shows that the majority are associated with H2O masers. Maser studies of EGOs also provide important constraints for the longstanding goal of a maser evolutionary sequence for MYSOs, particularly in combination with high resolution (sub)mm data. New SMA results show that Class I methanol masers can be excited by both young (hot core) and evolved (ultracompact HII region) sources within the same massive star-forming region.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

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