PMO OpenIR  > 分子云与恒星形成研究团组
Near-Infrared Imaging Polarization Study of M 17
Chen, Zhiwei1,2,3; Jiang, Zhibo1; Wang, Yuan1; Chini, Rolf4,5; Tamura, Motohide6; Nagayama, Takahiro6; Nagata, Tetsuya7; Nakajima, Yasushi8
2012-10-25
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume64Issue:5
AbstractWe 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.
KeywordInfrared: Ism Ism: Individual (m 17) Polarization Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordYOUNG STELLAR OBJECTS ; T-TAURI STARS ; MAGNETIC-FIELD STRUCTURE ; POINT-LIKE SOURCES ; LINEAR-POLARIZATION ; MOLECULAR CLOUD ; BIPOLAR NEBULAE ; M17 ; POLARIMETRY ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000313147600022
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15538
Collection分子云与恒星形成研究团组
Affiliation1.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
Recommended Citation
GB/T 7714
Chen, Zhiwei,Jiang, Zhibo,Wang, Yuan,et al. Near-Infrared Imaging Polarization Study of M 17[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2012,64(5).
APA Chen, Zhiwei.,Jiang, Zhibo.,Wang, Yuan.,Chini, Rolf.,Tamura, Motohide.,...&Nakajima, Yasushi.(2012).Near-Infrared Imaging Polarization Study of M 17.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,64(5).
MLA Chen, Zhiwei,et al."Near-Infrared Imaging Polarization Study of M 17".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64.5(2012).
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