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AMMONIA AND CO OBSERVATIONS TOWARD LOW-LUMINOSITY 6.7 GHz METHANOL MASERS

文献类型：期刊论文

作者Wu, Y. W.1; Xu, Y.1; Pandian, J. D.2,3; Yang, J.1; Henkel, C.3; Menten, K. M.3; Zhang, S. B.1
刊名ASTROPHYSICAL JOURNAL
出版日期2010-09-01
卷号720期号:1页码:392-408
ISSN号0004-637X
关键词ISM: jets and outflows ISM: molecules masers stars: formation
英文摘要To investigate whether distinctions exist between low- and high-luminosity Class II 6.7 GHz methanol masers, we have undertaken multi-line mapping observations of various molecular lines, including the NH(3) (1,1), (2,2), (3,3), (4,4), and (12)CO (1-0) transitions, toward a sample of nine low-luminosity 6.7 GHz masers and (12)CO (1-0) observations toward a sample of eight high-luminosity 6.7 GHz masers, for which we already had NH(3) spectral line data. Emission in the NH(3) (1,1), (2,2), and (3,3) transitions was detected in eight out of nine low-luminosity maser sources, in which 14 cores were identified. We derive densities, column densities, temperatures, core sizes, and masses of both low- and high-luminosity maser regions. A comparative analysis of the physical quantities reveals marked distinctions between the low-luminosity and high-luminosity groups: in general, cores associated with high-luminosity 6.7 GHz masers are larger and more massive than those traced by low-luminosity 6.7 GHz masers; regions traced by the high-luminosity masers have larger column densities but lower densities than those of the low-luminosity maser regions. Further, strong correlations between 6.7 GHz maser luminosity and NH3 (1,.1) and (2,2) line widths are found, indicating that internal motions in high-luminosity maser regions are more energetic than those in low-luminosity maser regions. A (12)CO (1-0) outflow analysis also shows distinctions in that outflows associated with high-luminosity masers have wider line wings and larger sizes than those associated with low-luminosity masers.
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]STAR-FORMING REGIONS ; GALACTIC PLANE SURVEY ; H-II REGIONS ; MOLECULAR OUTFLOWS ; TRIGONOMETRIC PARALLAXES ; INTERSTELLAR AMMONIA ; INFRARED SOURCES ; DUST EMISSION ; OUTER GALAXY ; IRAS SOURCES
收录类别SCI
语种英语
WOS记录号WOS:000281596000034
公开日期2011-12-29
源URL[http://159.226.72.40/handle/332002/1759]  
专题紫金山天文台_紫金山天文台青海观测站
作者单位1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
3.Max Planck Inst Radioastron, D-53121 Bonn, Germany
推荐引用方式
GB/T 7714		 Wu, Y. W.,Xu, Y.,Pandian, J. D.,et al. AMMONIA AND CO OBSERVATIONS TOWARD LOW-LUMINOSITY 6.7 GHz METHANOL MASERS[J]. ASTROPHYSICAL JOURNAL,2010,720(1):392-408.
APA Wu, Y. W..,Xu, Y..,Pandian, J. D..,Yang, J..,Henkel, C..,...&Zhang, S. B..(2010).AMMONIA AND CO OBSERVATIONS TOWARD LOW-LUMINOSITY 6.7 GHz METHANOL MASERS.ASTROPHYSICAL JOURNAL,720(1),392-408.
MLA Wu, Y. W.,et al."AMMONIA AND CO OBSERVATIONS TOWARD LOW-LUMINOSITY 6.7 GHz METHANOL MASERS".ASTROPHYSICAL JOURNAL 720.1(2010):392-408.

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