A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)

	A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)
	He JH(何金华)1 ; Takahashi, S 2; Chen, X 3
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2012-09
卷号	202 期号:1
关键词	ISM: clouds ISM: jets and outflows ISM: kinematics and dynamics radio lines: ISM stars: formation turbulence
ISSN号	0067-0049
通讯作者	He, JH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan Province, Peoples R China.
产权排序	第一完成单位
英文摘要	A northern subsample of 89 Spitzer GLIMPSE extended green objects (EGOs), the candidate massive young stellar objects, are surveyed for molecular lines in two 1 GHz ranges: 251.5-252.5 and 260.188-261.188 GHz. A comprehensive catalog of observed molecular line data and spectral plots are presented. Eight molecular species are undoubtedly detected: (HCO+)-C-13, SiO, SO, CH3OH, CH3OCH3, CH3CH2CN, HCOOCH3, and (HNC)-C-13. The (HCO+)-C-13 3-2 line is detected in 70 EGOs, among which 37 also show the SiO 6-5 line, demonstrating their association with dense gas and supporting the outflow interpretation of the extended 4.5 mu m excess emission. Our major dense gas and outflow tracers ((HCO+)-C-13, SiO, SO, and CH3OH) are combined with our previous survey of (CO)-C-13, (CO)-C-12, and (CO)-O-18 1-0 toward the same sample of EGOs for a multi-line, multi-cloud analysis of linewidth and luminosity correlations. Good log-linear correlations are found among all considered line luminosities, the explanation of which requires a universal similarity of density and thermal structures and probably of shock properties among all EGO clouds. It also requires that the shocks be produced within the natal clouds of the EGOs. Diverse degrees of correlation are found among the linewidths. However, both the linewidth and luminosity correlations tend to progressively worsen across larger cloud subcomponent size scales, depicting the increase of randomness across cloud subcomponent sizes. Moreover, the linewidth correlations among the three isotopic CO 1-0 lines show data scatter as linear functions of the linewidth itself, indicating that the velocity randomness also increases with whole cloud sizes in a regular way.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	FAST MOLECULAR SHOCKS ; INFRARED DARK CLOUDS ; MASS STAR-FORMATION ; METHANOL MASERS ; CLASS-I ; INTERSTELLAR SHOCKS ; COLOGNE DATABASE ; HOT CORES ; CHEMISTRY ; EMISSION
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0067-0049/202/1/1/meta
语种	英语
WOS记录号	WOS:000309557300001
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4523]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Astronomical Observatory/National Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650011 Yunnan Province, China 2.Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan 3.Key Laboratory for Research in Galaxies and Cosmology, Key Laboratory of Radio Astronomy, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China
推荐引用方式 GB/T 7714	He JH,Takahashi, S,Chen, X. A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2012,202(1).
APA	He JH,Takahashi, S,&Chen, X.(2012).A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs).ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,202(1).
MLA	He JH,et al."A 1 mm SPECTRAL LINE SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 202.1(2012).