Interaction between the Northern Coalsack in the Cygnus OB 7 cloud complex and multiple supernova remnants including HB 21
Interaction between the Northern Coalsack in the Cygnus OB 7 cloud complex and multiple supernova remnants including HB 21
复制标题
天鹅座 OB 7 云复合体中的北煤袋与包括 HB 21 在内的多个超新星遗迹之间的相互作用
DOI：
10.1093/pasj/psy122
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发表时间：
2019
影响因子：
2.3
通讯作者：
and Jean-Philippe Bernard
中科院分区：
文献类型：
--
作者：
Kazuhito Dobashi;Tomomi Shimoikura;Nobuhiro Endo;Chisato Takagi;Fumitaka Nakamura;Yoshito Shimajiri;and Jean-Philippe Bernard
我们报道了多个超新星遗迹(SNR)和北方煤袋(NC)之间可能的相互作用，北方煤袋是天鹅座OB/7云复合体中的一个大质量团(∼1×103m⊙)，正在形成一个巨大的0级天体。我们利用野山射电天文台的45 m望远镜对12CO(J=1-0)、13CO(J=1-0)和C18O(J=1-0)发射线进行了分子观测，发现在VLSR≃−20、−6、−4和10 Km S−1有四个主要速度分量。−6和−4 Km S−1分量分别对应于NCS和Cyg OB 7复合体的系统速度，其他速度分量来自不同的小云。有趣的是，这四个分量的空间分布之间存在明显的相关性和反相关性，表明它们之间存在物理上的相互作用。在更大尺度上，我们发现一组属于−20和10 KM S−1分量的小云团位于包括HB-21在内的一些SNR周围的两条不同的弧线上，这被认为是与Cyg OB 7云团相互作用的，我们还发现NCS正好位于这些弧线的交界面上。这些小云很可能是被产生SNR的大质量恒星的恒星风卷起的气体。我们认为，沿两条弧线排列的小云最近遇到了NCS，NCS中大质量恒星的形成是由小云的强烈相互作用引发的。
We report on possible interaction between multiple supernova remnants (SNRs) and the Northern Coalsack (NCS), which is a massive clump (∼1 × 103M⊙) in the Cygnus OB 7 cloud complex and is forming a massive Class 0 object. We performed molecular observations of the12CO(J= 1–0),13CO(J= 1–0), and C18O(J= 1–0) emission lines using the 45 m telescope at the Nobeyama Radio Observatory, and we found that there are four main-velocity components atVLSR≃ −20, −6, −4, and 10 km s−1. The −6 and −4 km s−1components correspond to the systemic velocities of NCS and the Cyg OB 7 complex, respectively, and the other velocity components originate from distinct smaller clouds. Interestingly, there are apparent correlations and anticorrelations among the spatial distributions of the four components, suggesting that they are physically interacting with one another. On a larger scale, we find that a group of small clouds belonging to the −20 and 10 km s−1components are located along two different arcs around some SNRs including HB 21, which has been suggested to be interacting with the Cyg OB 7 cloud complex, and we also find that NCS is located right at the interface of the arcs. The small clouds are likely to be the gas swept up by the stellar wind of the massive stars that created the SNRs. We suggest that the small clouds aligned along the two arcs recently encountered NCS, and the massive star formation in NCS was triggered by the strong interaction of the small clouds.