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

School of Physics and Astronomy

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

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 μmband, 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.

Original language	English
Title of host publication	Cosmic Masers -- from OH to H0
Subtitle of host publication	Proceedings of the International Astronomical Union
Pages	127-132
Volume	287
DOIs	https://doi.org/10.1017/S1743921312006783
Publication status	Published - 1 Jul 2012

Keywords

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

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10.1017/S1743921312006783

http://adsabs.harvard.edu/abs/2012IAUS..287..127C

Cite this

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title = "Masers in GLIMPSE Extended Green Objects (EGOs)",

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 μmband, 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.",

keywords = "infrared: ISM- infrared: stars- ISM: jets and outflows- ISM: molecules- masers- radio continuum: ISM- stars: formation- techniques: interferometric",

author = "Cyganowski, {Claudia J.} and Brogan, {Crystal L.} and Hunter, {Todd R.} and Ed Churchwell and Jin Koda and Erik Rosolowsky and Sarah Towers and Barb Whitney and Qizhou Zhang",

year = "2012",

month = jul,

day = "1",

doi = "10.1017/S1743921312006783",

language = "English",

volume = "287",

pages = "127--132",

booktitle = "Cosmic Masers -- from OH to H0",

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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

PY - 2012/7/1

Y1 - 2012/7/1

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 μmband, 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.

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 μmband, 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.

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

U2 - 10.1017/S1743921312006783

DO - 10.1017/S1743921312006783

M3 - Conference contribution

VL - 287

SP - 127

EP - 132

BT - Cosmic Masers -- from OH to H0

ER -

Masers in GLIMPSE Extended Green Objects (EGOs)

Abstract

Keywords

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