1.3 mm POLARIZED EMISSION IN THE CIRCUMSTELLAR DISK OF A MASSIVE PROTOSTAR

1.3 mm POLARIZED EMISSION IN THE CIRCUMSTELLAR DISK OF A MASSIVE PROTOSTAR
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大质量原恒星星盘中的 1.3 毫米偏振发射

DOI:
10.3847/0004-637x/832/2/200
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发表时间:
2016
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
S. Lai
S. Lai
中科院分区:
--
文献类型:
--
作者:
M. Fernández;I. Stephens;I. Stephens;I. Stephens;J. Girart;J. Girart;L. Looney;S. Curiel;D. Segura;C. Eswaraiah;S. Lai

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我们提出了第一个解决的1.3毫米偏振发射的高质量的原恒星仙王座A HW 2周围的盘状结构的观测。这些CARMA数据部分解决了尘埃偏振,表明偏振矢量的平均位置角为57 ° ± 6 °,平均偏振分数为2.0% ± 0.4%的均匀形态。极化矢量的分布可以归因于(1)由均匀磁场直接发射的磁性排列的尘埃颗粒,或者(2)由倾斜圆盘散射产生的图案。我们表明,这两种模型可以解释的意见,也许是两种机制的组合产生的偏振发射。第三个模型包括一个环形磁场与观测结果不符。假设散射是极化机制,这些观测结果表明,在大质量星星形成的最初104年里,颗粒大小可以从1 μ m增长到几十μm。
We present the first resolved observations of the 1.3 mm polarized emission from the disk-like structure surrounding the high-mass protostar Cepheus A HW2. These CARMA data partially resolve the dust polarization, suggesting a uniform morphology of polarization vectors with an average position angle of 57 ° ± 6 ° and an average polarization fraction of 2.0 % ± 0.4 % . The distribution of the polarization vectors can be attributed to (1) the direct emission of magnetically aligned grains of dust by a uniform magnetic field, or (2) the pattern produced by the scattering of an inclined disk. We show that both models can explain the observations, and perhaps a combination of the two mechanisms produces the polarized emission. A third model including a toroidal magnetic field does not match the observations. Assuming scattering is the polarization mechanism, these observations suggest that during the first few 104 years of high-mass star formation, grain sizes can grow from 1 μ m to several 10s μm.
DOI: 10.1088/0004-637x/693/1/406
发表时间: 2008-11
期刊: The Astrophysical Journal
影响因子: --
作者:
L. Moscadelli;Mark J. Reid;K. Menten;A. Brunthaler;X. Zheng;Ye Xu;Ye Xu
通讯作者: L. Moscadelli;Mark J. Reid;K. Menten;A. Brunthaler;X. Zheng;Ye Xu;Ye Xu
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DOI: 10.1088/0004-637x/703/2/l157
发表时间: 2009
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: Jiménez-Serra I