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Resolving Linear Polarization due to Emission and Extinction of Aligned Dust Grains on NGC 1333 IRAS4A with JVLA and ALMA
Ko,Chia-Lin1,2; Liu,Hauyu Baobab2,3; Lai,Shih-Ping1; Ching,Tao-Chung4,5; Rao,Ramprasad2; Girart,Josep Miquel6,7
2020-02-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume889Issue:2
AbstractAbstract We report high angular resolution observations of linearly polarized dust emission toward the Class 0 young stellar object NGC1333 IRAS4A (hereafter IRAS4A) using the Karl G. Jansky Very Large Array at K (11.5–16.7 mm), Ka (8.1–10.3 mm), and Q bands (6.3–7.9 mm), and using the Atacama Large Millimeter Array (ALMA) at Band 6 (1.3 mm) and Band 7 (0.85–0.89 mm). On 100–1000 au scales, all of these observations consistently trace the hourglass-shaped magnetic field topology as shown in the previous studies. In the innermost 100 au region of IRAS4A1, the polarization position angles (E field) detected at 6.3–16.7 mm are consistent; however, they are nearly 90° offset from those detected at 1.3 mm and 0.85–0.89 mm. Such a 90° offset may be explained by the inner ~100 au area being optically thick at wavelengths shorter than ~1.5 mm, whereby the observations probe the absorption of aligned dust against the weakly or unpolarized warm dust emission from the innermost region. This can also consistently explain why the highest angular resolution ALMA images at Band 7 show that the polarization percentage increases with dust brightness temperature in the inner ~100 au region of IRAS4A1. Following this interpretation and assuming that the dust grains are aligned with the magnetic fields, the inferred magnetic field position angle based on the 90° rotated at 6.3–7.9 mm in the central peak of IRAS4A1 is ~?22°, which is approximately consistent with the outflow direction of ~?9°.
KeywordStar formation Magnetic fields Polarimetry Interstellar medium Protostars
DOI10.3847/1538-4357/ab5e79
Language英语
WOS IDIOP:0004-637X-889-2-ab5e79
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/53954
Collection中国科学院国家天文台
Affiliation1.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
2.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan
3.European Southern Observatory (ESO), Karl-Schwarzschild-Str. 2, D-85748, Garching, Germany
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
5.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People's Republic of China
6.Institut de Ciències de l’Espai (ICE, CSIC), Can Magrans, s/n, E-08193, Cerdanyola del Vallès, Catalonia, Spain
7.Institut d’Estudis Espacials de Catalunya (IEEC), E-08034, Barcelona, Catalonia, Spain
Recommended Citation
GB/T 7714
Ko,Chia-Lin,Liu,Hauyu Baobab,Lai,Shih-Ping,et al. Resolving Linear Polarization due to Emission and Extinction of Aligned Dust Grains on NGC 1333 IRAS4A with JVLA and ALMA[J]. The Astrophysical Journal,2020,889(2).
APA Ko,Chia-Lin,Liu,Hauyu Baobab,Lai,Shih-Ping,Ching,Tao-Chung,Rao,Ramprasad,&Girart,Josep Miquel.(2020).Resolving Linear Polarization due to Emission and Extinction of Aligned Dust Grains on NGC 1333 IRAS4A with JVLA and ALMA.The Astrophysical Journal,889(2).
MLA Ko,Chia-Lin,et al."Resolving Linear Polarization due to Emission and Extinction of Aligned Dust Grains on NGC 1333 IRAS4A with JVLA and ALMA".The Astrophysical Journal 889.2(2020).
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