Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN
Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN
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DOI：
10.1093/mnrasl/slt114
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发表时间：
2013-11-01
影响因子：
4.8
通讯作者：
Beswick, Rob J.
中科院分区：
文献类型：
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作者：
Ainsworth, Rachael E.;Ray, Tom P.;Beswick, Rob J.
我们提出了非常高的空间分辨率深射电连续观测5 GHz（6厘米）的扩展多元无线电链接干涉仪网络（e-MERLIN）的年轻恒星DG Tau A和B。假设它是非常接近（类似或等于1 Au）从恒星发射，我们的研究结果表明，DG Tau A流出最初开始作为一个不好集中的风，并经历了显着的准直进一步沿射流（类似或等于50 Au）。我们推导出DG Tau A的喷流参数，发现在距离源2 Au的范围内，初始喷流张开角为86度，喷流电离成分的质量损失率为1.5 × 10（-8）M-圈点yr（-1），总的喷射吸积比范围为0.06至0.3。这些结果与磁流体动力学喷气发射理论的预测是一致的。
We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (e-MERLIN) of the young stars DG Tau A and B. Assuming it is launched very close (similar or equal to 1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation farther along the jet (similar or equal to 50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5 x 10(-8) M-circle dot yr(-1) for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.