Masers in GLIMPSE Extended Green Objects (EGOs)

Claudia J. Cyganowski; Crystal L. Brogan; Todd R. Hunter; Ed Churchwell; Jin Koda; Erik Rosolowsky; Sarah Towers; Barb Whitney; Qizhou Zhang

doi:10.1017/S1743921312006783

Masers in GLIMPSE Extended Green Objects (EGOs)

Claudia J. Cyganowski
, Crystal L. Brogan
, Todd R. Hunter
, Ed Churchwell
, Jin Koda
, Erik Rosolowsky
, Sarah Towers
, Barb Whitney
, Qizhou Zhang

Physics and Astronomy

Harvard-Smithsonian Ctr. Astrophys.
National Science Foundation
University of Wisconsin-Madison
University of British Columbia
Stony Brook University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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 band, believed to trace shocked molecular gas. Maser studies of these extended 4.5 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.

Original language	English
Title of host publication	Cosmic Masers - from OH to H0
Publisher	Cambridge University Press
Pages	127-132
Number of pages	6
Edition	S287
ISBN (Print)	9781107032842
DOIs	https://doi.org/10.1017/S1743921312006783
State	Published - Jul 2012

Publication series

Name	Proceedings of the International Astronomical Union
Number	S287
Volume	8
ISSN (Print)	1743-9213
ISSN (Electronic)	1743-9221

Keywords

infrared: ISM
infrared: stars
ISM: jets and outflows
ISM: molecules
masers
radio continuum: ISM
stars: formation
techniques: interferometric

Access to Document

10.1017/S1743921312006783

Cite this

Cyganowski, C. J., Brogan, C. L., Hunter, T. R., Churchwell, E., Koda, J., Rosolowsky, E., Towers, S., Whitney, B., & Zhang, Q. (2012). Masers in GLIMPSE Extended Green Objects (EGOs). In Cosmic Masers - from OH to H0 (S287 ed., pp. 127-132). (Proceedings of the International Astronomical Union; Vol. 8, No. S287). Cambridge University Press. https://doi.org/10.1017/S1743921312006783

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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 band, believed to trace shocked molecular gas. Maser studies of these extended 4.5 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.",

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year = "2012",

month = jul,

doi = "10.1017/S1743921312006783",

language = "English",

isbn = "9781107032842",

series = "Proceedings of the International Astronomical Union",

publisher = "Cambridge University Press",

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Masers in GLIMPSE Extended Green Objects (EGOs). / Cyganowski, Claudia J.; Brogan, Crystal L.; Hunter, Todd R. et al.
Cosmic Masers - from OH to H0. S287. ed. Cambridge University Press, 2012. p. 127-132 (Proceedings of the International Astronomical Union; Vol. 8, No. S287).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Masers in GLIMPSE Extended Green Objects (EGOs)

AU - Cyganowski, Claudia J.

AU - Brogan, Crystal L.

AU - Hunter, Todd R.

AU - Churchwell, Ed

AU - Koda, Jin

AU - Rosolowsky, Erik

AU - Towers, Sarah

AU - Whitney, Barb

AU - Zhang, Qizhou

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N2 - 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 band, believed to trace shocked molecular gas. Maser studies of these extended 4.5 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.

AB - 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 band, believed to trace shocked molecular gas. Maser studies of these extended 4.5 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.

KW - infrared: ISM

KW - infrared: stars

KW - ISM: jets and outflows

KW - ISM: molecules

KW - masers

KW - radio continuum: ISM

KW - stars: formation

KW - techniques: interferometric

UR - https://www.scopus.com/pages/publications/84864495837

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DO - 10.1017/S1743921312006783

M3 - Conference contribution

AN - SCOPUS:84864495837

SN - 9781107032842

T3 - Proceedings of the International Astronomical Union

SP - 127

EP - 132

BT - Cosmic Masers - from OH to H0

PB - Cambridge University Press

ER -

Masers in GLIMPSE Extended Green Objects (EGOs)

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