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题名: MASSIVE QUIESCENT CORES IN ORION. VI. THE INTERNAL STRUCTURES AND A CANDIDATE OF TRANSITING CORE IN NGC 2024 FILAMENT
作者: Ren, Zhiyuan1, 2, 3; Li, Di1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-06-10
卷号: 824, 期号:1
关键词: ISM: clouds ; ISM: individual objects (NGC 2024, Orion) ; ISM: molecules ; stars: formation ; stars: low-mass
DOI: 10.3847/0004-637X/824/1/52
文章类型: Article
英文摘要: We present a multiwavelength observational study of the NGC 2024 filament using infrared to submillimeter continuum and the NH3 (1, 1) and (2, 2) inversion transitions centered on FIR-3, the most massive core therein. FIR-3 is found to have no significant infrared point sources in the Spitzer/IRAC bands. But the NH3 kinetic temperature map shows a peak value at the core center with T-k = 25 K, which is significantly higher than the surrounding level (T-k = 15-19 K). Such internal heating signature without an infrared source suggests an ongoing core collapse possibly at a transition stage from first hydrostatic core (FHSC) to protostar. The eight dense cores in the filament have dust temperatures between 17.5 and 22 K. They are much cooler than the hot ridge (T-d similar to 55 K) around the central heating star IRS-2b. Comparison with a dust heating model suggests that the filament should have a distance of 3-5 pc from IRS-2b. This value is much larger than the spatial extent of the hot ridge, suggesting that the filament is spatially separated from the hot region along the line of sight.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: 1ST HYDROSTATIC CORE ; YOUNG STELLAR OBJECTS ; STAR-FORMING REGIONS ; GOULD BELT SURVEY ; DENSE CORES ; PROTOSTELLAR CORES ; MOLECULAR CLOUDS ; SPECTRAL ENERGY ; HIGH-RESOLUTION ; MAGNETIC-FIELD
收录类别: SCI
项目资助者: China Ministry of Science and Technology under State Key Development Program for Basic Research (973 program)(2012CB821802) ; National Natural Science Foundation of China(11403041 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB09010302) ; Young Researcher Grant of the National Astronomical Observatories, Chinese Academy of Sciences ; 11373038 ; 11373045)
语种: 英语
WOS记录号: WOS:000377937300052
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16236
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Chaoyang Dist Datun Rd A20, Beijing, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
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