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题名: A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)
作者: Chen, Xi1, 2; Ellingsen, Simon P.3; Shen, Zhi-Qiang1, 2; Titmarsh, Anita3; Gan, Cong-Gui1, 2
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2011-09-01
卷号: 196, 期号:1
关键词: ISM: molecules ; masers ; radio lines: ISM ; stars: formation
DOI: 10.1088/0067-0049/196/1/9
文章类型: Article
英文摘要: We report the results of a systematic survey for 95 GHz class I methanol masers toward a new sample of 192 massive young stellar object candidates associated with ongoing outflows (known as extended green objects or EGOs) identified from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey. The observations were made with the Australia Telescope National Facility (ATNF) Mopra 22 m radio telescope and resulted in the detection of 105 new 95 GHz class I methanol masers. For 92 of the sources our observations provide the first identification of a class I maser transition associated with these objects (i.e., they are new class I methanol maser sources). Our survey proves that there is indeed a high detection rate (55%) of class I methanol masers toward EGOs. Comparison of the GLIMPSE point sources associated with EGOs with and without class I methanol maser detections shows that they have similar mid-IR colors, with the majority meeting the color selection criteria -0.6 < [5.8]-[8.0] < 1.4 and 0.5 < [3.6]-[4.5] < 4.0. Investigations of the Infrared Array Camera and Multiband Imaging Photometer for Spitzer 24 mu m colors and the associated millimeter dust clump properties (mass and density) of the EGOs for the sub-samples based on the class of methanol masers they are associated with suggest that the stellar mass range associated with class I methanol masers extends to lower masses than for class II methanol masers, or alternatively class I methanol masers may be associated with more than one evolutionary phase during the formation of a high-mass star.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR-FORMING REGIONS ; INFRARED-DARK CLOUDS ; YOUNG STELLAR OBJECTS ; GALACTIC PLANE ; MOLECULAR CLOUD ; PHYSICAL-PROPERTIES ; GENERAL CATALOG ; MU-M ; SPITZER ; OUTFLOW
收录类别: SCI
语种: 英语
WOS记录号: WOS:000294773400009
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15972
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Shanghai 200030, Peoples R China
3.Univ Tasmania, Sch Math & Phys, Hobart, Tas, Australia
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