Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center
Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center
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发现银河系中心红外双螺旋星云可能的分子对应物
DOI：
10.1088/0004-637x/780/1/72
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
et al.
中科院分区：
文献类型：
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作者：
Enokiya;R.;et al.
我们发现了 NANTEN2 向银河系中心红外双螺旋星云 (DHN) 的径向速度分别为 − 35 km s− 1 和 0 km s− 1 的两个分子特征。这两个特征与 DHN 表现出良好的空间对应关系。我们还发现了两个细长的分子脊，这两个速度在 0 fdg 8 上垂直于银河平面分布。这两个脊通过速度的广泛特征连接起来，并且很可能在物理上相互连接。脊中 12 CO J= 2–1 和 J= 1–0 跃迁之间的比率为 0.8，大于前景气体中的平均值 0.5，表明这两个脊位于银河系中心。对 K 波段消光的检查表明与 CO 0 km s−1 脊有很好的重合性，并且与 8±2 kpc 的距离一致。我们讨论了 DHN 是由包含从环核盘发射的扭转阿尔文波的磁现象产生的可能性，并提出了 DHN 中涉及的质量和能量的第一个估计。
We have discovered two molecular features at radial velocities of− 35 km s− 1 and 0 km s− 1 toward the infrared Double Helix Nebula (DHN) in the Galactic center with NANTEN2. The two features show good spatial correspondence with the DHN. We have also found two elongated molecular ridges at these two velocities distributed vertically to the Galactic plane over 0 fdg 8. The two ridges are linked by broad features in velocity and are likely connected physically with each other. The ratio between the 12 CO J= 2–1 and J= 1–0 transitions is 0.8 in the ridges which is larger than the average value 0.5 in the foreground gas, suggesting the two ridges are in the Galactic center. An examination of the K band extinction reveals a good coincidence with the CO 0 km s− 1 ridge and is consistent with a distance of 8±2 kpc. We discuss the possibility that the DHN was created by a magnetic phenomenon incorporating torsional Alfvén waves launched from the circum-nuclear disk and present a first estimate of the mass and energy involved in the DHN.