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题名: Near-Infrared Imaging Polarization Study of M 17
作者: Chen, Zhiwei1, 2, 3; Jiang ZhiBo(江治波)1; Wang Yuan(王渊)1; Chini, Rolf4, 5; Tamura, Motohide6; Nagayama, Takahiro6; Nagata, Tetsuya7; Nakajima, Yasushi8
刊名: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
出版日期: 2012-10-25
卷号: 64, 期号:5
关键词: infrared: ISM ; ISM: individual (M 17) ; polarization ; stars: formation
文章类型: Article
英文摘要: We conducted wide-field (similar to 8' x 8') JHK(s) imaging polarimetric observations toward the massive star-formation region M 17. The southern H it bar is identified as large-scale infrared reflection nebula (IRN) illuminated by OB stars in the cluster center, while the northern bar shows polarization originating from dichroic extinction. Three small-scale bipolar IRN with centro-symmetric polarization patterns were identified, and their illuminating sources, embedded young stellar objects (YSOs), are most likely the driving sources of bipolar outflows. JHK(s) polarizations of point sources in M 17 show a wavelength dependence of the polarization of dichroic extinction in the general interstellar medium, indicating alpha similar to 1.8 for the empirical relation P proportional to lambda(-alpha) of interstellar polarization. The distribution of the polarization angle shows two peaks at 170 degrees and 110 degrees, indicating a non-uniform magnetic field structure in M 17. The direction of the magnetic field in the cluster region is south-north. However, the magnetic field in the HI! region is roughly between 100 degrees-140 degrees, roughly perpendicular to the Galactic disk. Such a configuration indicates that the magnetic field in the cluster region is twisted from the primordial orientation in the cluster formation. The magnetic field in the southern bar has a total strength of similar to 230 mu G, and is 40 degrees inclined to the plane of the sky. The outflows driven by YSOs in M 17 show a poor relation with the surrounding magnetic fields. This fact implies that the magnetic field in M 17 does not dominate the orientations of protostars formed inside.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: YOUNG STELLAR OBJECTS ; T-TAURI STARS ; MAGNETIC-FIELD STRUCTURE ; POINT-LIKE SOURCES ; LINEAR-POLARIZATION ; MOLECULAR CLOUD ; BIPOLAR NEBULAE ; M17 ; POLARIMETRY ; EMISSION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000313147600022
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15538
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
4.Ruhr Univ Bochum, Astron Inst, D-44780 Bochum, Germany
5.Univ Catolica Norte, Inst Astron, Antofagasta, Chile
6.Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
7.Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan
8.Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan
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