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The formation of the young massive cluster B1 in the Antennae Galaxies (NGC 4038/NGC 4039) triggered by cloud–cloud collision
Publications of the Astronomical Society of Japan ( IF 2.2 ) Pub Date : 2021-01-18 , DOI: 10.1093/pasj/psab008
Kisetsu Tsuge 1 , Kengo Tachihara 1 , Yasuo Fukui 1, 2 , Hidetoshi Sano 3 , Kazuki Tokuda 3, 4 , Junko Ueda 3 , Daisuke Iono 3, 5
Affiliation  

The Antennae Galaxies, one of major mergers, are a starburst. Tsuge et al. (2020, PASJ, 73, S35) showed that the five giant molecular complexes in the Antennae Galaxies have signatures of cloud–cloud collisions based on the Atacama Large Millimeter Array (ALMA) archival data with 60 pc resolution. In the present work we analyzed the new CO data toward the super star cluster (SSC) B1 with 14 pc resolution obtained with ALMA, and confirm that two clouds show a complementary distribution with a displacement of ∼70 pc as well as connecting bridge features between them. The complementary distribution shows a good correspondence with the theoretical collision model (Takahira et al. 2014, ApJ, 792, 63), and the distribution indicates that the formation of SSC B1 with ∼106 M⊙ was consistent with the trigger of cloud–cloud collision on a time scale of ∼1 Myr, which is consistent with the cluster age. It is likely that SSC B1 was formed from molecular gas of ∼107 M⊙ with a star formation efficiency of $\sim\! 10\%$ in 1 Myr. We identify a few places where additional clusters are forming. Detailed gas motion indicates that the stellar feedback in the accelerating gas is not effective, while the ionization plays a role in evacuating the gas around the clusters at a ∼20 pc radius. The results have revealed the details of the parent gas where a cluster having a mass similar to a globular is being formed.

中文翻译:

云-云碰撞引发触角星系(NGC 4038/NGC 4039)中年轻大质量星团B1的形成

天线星系是主要的合并之一,是一次爆炸。Tsuge 等人。(2020, PASJ, 73, S35) 根据分辨率为 60 pc 的阿塔卡马大毫米阵列 (ALMA) 档案数据,表明天线星系中的五个巨型分子复合体具有云-云碰撞的特征。在目前的工作中,我们分析了使用 ALMA 获得的具有 14 pc 分辨率的超星团 (SSC) B1 的新 CO 数据,并确认两个云显示出互补分布,位移约为 70 pc 以及连接之间的桥梁特征他们。互补分布与理论碰撞模型有很好的对应关系(Takahira et al. 2014, ApJ, 792, 63),分布表明~106 M⊙的SSC B1的形成与~1 Myr时间尺度上的云-云碰撞触发一致,与星团年龄一致。SSC B1很可能是由~107 M⊙的分子气体形成的,恒星形成效率为$\sim\!1 Myr 中的 10\%$。我们确定了一些正在形成其他集群的地方​​。详细的气体运动表明加速气体中的恒星反馈无效,而电离在疏散约 20 pc 半径的星团周围的气体中起作用。结果揭示了正在形成质量类似于球状的团簇的母体气体的细节。SSC B1很可能是由~107 M⊙的分子气体形成的,恒星形成效率为$\sim\!1 Myr 中的 10\%$。我们确定了一些正在形成其他集群的地方​​。详细的气体运动表明加速气体中的恒星反馈无效,而电离在疏散约 20 pc 半径的星团周围的气体中起作用。结果揭示了正在形成质量类似于球状的团簇的母体气体的细节。SSC B1很可能是由~107 M⊙的分子气体形成的,恒星形成效率为$\sim\!1 Myr 中的 10\%$。我们确定了一些正在形成其他集群的地方​​。详细的气体运动表明加速气体中的恒星反馈无效,而电离在疏散约 20 pc 半径的星团周围的气体中起作用。结果揭示了正在形成质量类似于球状的团簇的母体气体的细节。
更新日期:2021-01-18
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