论文标题
猎户座中的星团形成
Star Cluster Formation in Orion A
论文作者
论文摘要
我们介绍了用于研究Orion A中星团形成过程的新分析方法，尤其是检查云云碰撞的情况。我们利用Carma-Nro orion调查$^{13} $ CO（1-0）数据比较分子气体与SDSS III INC INCINC调查中的YSO的属性。我们表明，$ v _ {\ rm 13co} -v _ {\ rm yso} $的增加，旧ysos的散布可能是云云碰撞的信号。 Sofia-Upgreat 158 $ m $ m [CII]对猎户座北部北部的档案数据也与$^{13} $ CO数据进行了比较，以测试这两个过渡的位置和速度偏移是否相似于云碰撞模型所预测的两个过渡。我们发现，Orion A的北部，包括onc-omc-1，OMC-2，OMC-2，OMC-3和OMC-4，显示了与云云碰撞方案的定性协议，而在南部地区之一，NGC1999，没有任何迹象表明会引起新星诞生的过程。另一方面，另一个南部集群L1641N显示出云云碰撞的轻微趋势。总体而言，我们的结果支持云云碰撞过程是Orion A中星团形成的重要机制。
We introduce new analysis methods for studying the star cluster formation processes in Orion A, especially examining the scenario of a cloud-cloud collision. We utilize the CARMA-NRO Orion survey $^{13}$CO (1-0) data to compare molecular gas to the properties of YSOs from the SDSS III IN-SYNC survey. We show that the increase of $v_{\rm 13CO} - v_{\rm YSO}$ and $Σ$ scatter of older YSOs can be signals of cloud-cloud collision. SOFIA-upGREAT 158$μ$m [CII] archival data toward the northern part of Orion A are also compared to the $^{13}$CO data to test whether the position and velocity offsets between the emission from these two transitions resemble those predicted by a cloud-cloud collision model. We find that the northern part of Orion A, including regions ONC-OMC-1, OMC-2, OMC-3 and OMC-4, shows qualitative agreements with the cloud-cloud collision scenario, while in one of the southern regions, NGC1999, there is no indication of such a process in causing the birth of new stars. On the other hand, another southern cluster, L1641N, shows slight tendencies of cloud-cloud collision. Overall, our results support the cloud-cloud collision process as being an important mechanism for star cluster formation in Orion A.
