Magnetically Regulated Disk Formation in the Inner 100 au Region of the Class 0 Young Stellar Object OMC-3/MMS 6 Resolved by JVLA and ALMA
Magnetically Regulated Disk Formation in the Inner 100 au Region of the Class 0 Young Stellar Object OMC-3/MMS 6 Resolved by JVLA and ALMA
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JVLA 和 ALMA 解决了 0 级年轻恒星 OMC-3/MMS 6 内部 100 au 区域的磁调节盘形成
DOI：
10.3847/1538-4357/abf8b6
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
H. Liu
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文献类型：
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作者：
H. Liu
我们对Jansky甚大阵（JVLA）（1.9 mm）全偏振观测的0级年轻天体（YSO）OMC-3/MMS 6（也称为HOPS-87）进行了偏振定标，然后将结果与阿塔卡马大毫米阵（阿尔马）1.2 mm观测的结果进行了比较。解析的光谱指数显示OMC-3/MMS 6的最里面的100 Au区域是边缘光学薄的（例如，τ <$1），这样JVLA观测就可以直接探测非球形尘埃的线偏振辐射。假设尘埃颗粒的投影长轴垂直于磁场（B-场）线，我们建议整体B-场拓扑结构类似于沙漏形状。这个系统的几何形状与磁调节致密（伪）盘一致，尽管这个“沙漏”似乎相对于先前报道的流出轴倾斜了大约40°。相比之下，该YSO的内部Au 100 Au区域可能非常光学厚（例如，τ 1）。由JVLA和阿尔马分辨的电场位置角在该区域上呈现约90°的偏移，这表明在1 mm波长处的主导偏振机制是二向色性消光。这是第二种情况下，（亚）毫米二向色性消光是由JVLA和阿尔马偏振观测之间的直接比较证明。
We have carried out polarization calibration for archival Jansky Very Large Array (JVLA) (∼9 mm) full polarization observations toward the Class 0 young stellar object (YSO) OMC-3/MMS 6 (also known as HOPS-87), and then compared the results with the archival Atacama Large Millimeter Array (ALMA) 1.2 mm observations. The resolved spectral indices show that the innermost ∼100 au region of OMC-3/MMS 6 is marginally optically thin (e.g., τ ≲ 1) at ∼9 mm wavelength, such that the JVLA observations can directly probe the linearly polarized emission from nonspherical dust. Assuming that the projected long axis of dust grains is aligned perpendicular to magnetic field (B-field) lines, we propose that the overall B-field topology resembles an hourglass shape. The geometry of this system is consistent with a magnetically regulated dense (pseudo)disk, although this “hourglass” appears to be ∼40° inclined with respect to the previously reported outflow axis. In contrast, the inner ∼100 au region of this YSO is likely very optically thick (e.g., τ ≫ 1) at ∼1 mm wavelength. The electric field position angles resolved by JVLA and ALMA present ∼90° offsets on this region, which indicate that the dominant polarization mechanism at 1 mm wavelength is dichroic extinction. This is the second case where the (sub)millimeter dichroic extinction is demonstrated by the direct comparison between the JVLA and ALMA polarization observations.
旋转轴与磁场错位对星周盘的影响
DOI：
10.3847/1538-4357/ab9f9d
发表时间：
2020
期刊：
The Astrophysical Journal
影响因子：
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作者：
Hirano Shingo;Tsukamoto Yusuke;Basu Shantanu;Machida Masahiro N.
通讯作者：
Machida Masahiro N.
低质量原恒星双星 NGC 1333 IRAS 4A1/4A2 中的坠落运动
DOI：
10.3847/1538-4357/ab4818
发表时间：
2019
期刊：
The Astrophysical Journal
影响因子：
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作者：
Su, Yu-Nung;Liu, Sheng-Yuan;Li, Zhi-Yun;Lee, Chin-Fei;Hirano, Naomi;Takakuwa, Shigehisa;Hsieh, I-Ta
通讯作者：
Hsieh, I-Ta
DOI：
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发表时间：
2019
期刊：
影响因子：
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作者：
Michael W. Richmond;Masaomi Tanaka;Tomoki Morokuma;Shigeyki Sako;Ryou Ohsawa;Noriaki Arima;Nozomu Tominaga;Mamoru Doi;et al.;Akimasa Kataoka
通讯作者：
Akimasa Kataoka