Gas emission and dynamics in the infrared dark cloud G31.23+0.05
Gas emission and dynamics in the infrared dark cloud G31.23+0.05
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红外暗云中的气体排放和动力学 G31.23 0.05
DOI：
10.1088/1674-4527/17/4/35
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发表时间：
2017
影响因子：
1.8
通讯作者：
Zhang Chuan-Peng
中科院分区：
文献类型：
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作者：
Liu Xiao-Lan;Wang Jun-Jie;Xu Jin-Long;Zhang Chuan-Peng
利用紫金山天文台新的CO观测资料和档案资料（GLIMPSE、MIPSGAL、HERSCHEL、ATLASGAL、BGPS和NVSS），对红外暗云（IRDC）G31.23+0.05进行了多波长研究。根据这些观测结果，我们确定了三个IRDC，其系统速度分别为108.36±0.06（云A）、104.22±0.11（云B）和75.73±0.07 km s−1（云C）。对分子和尘埃辐射的分析表明，云A是一个包含年轻恒星物体的行星结构;云B和C都包含一个无恒星的核心。星云A和B受到引力的束缚，有机会形成恒星。此外，速度信息和位置-速度图表明，云A和B在空间上是相邻的，并提供了一个线索，暗示可能的云-云碰撞。此外，粉尘温度的分布显示出温度泡。云A的致密核与UCHII区、IRAS源、H2O脉泽、CH 3OH脉泽和OH脉泽有关，表明那里有大质量星星形成活动。我们估计HII区的年龄为（0.03-0.09）Myr，表明里面的星星是年轻的。
We performed a multiwavelength study towards the infrared dark cloud (IRDC) G31.23+0.05 with new CO observations from Purple Mountain Observatory and archival data (the GLIMPSE, MIPSGAL, HERSCHEL, ATLASGAL, BGPS and NVSS surveys). From these observations, we identified three IRDCs with systemic velocities of 108.36±0.06 (cloud A), 104.22±0.11 (cloud B) and 75.73±0.07 km s−1 (cloud C) in the line of sight towards IRDC G31.23. Analyses of the molecular and dust emission suggest that cloud A is a filamentary structure containing a young stellar object; clouds B and C both include a starless core. Clouds A and B are gravitationally bound and have a chance to form stars. In addition, the velocity information and the position-velocity diagram suggest that clouds A and B are adjacent in space and provide a clue hinting at a possible cloud-cloud collision. Additionally, the distribution of dust temperature shows a temperature bubble. The compact core in cloud A is associated with an UCHII region, an IRAS source, H2O masers, CH3OH masers and OH masers, suggesting that massive star formation is active there. We estimate the age of the HII region to be (0.03–0.09) Myr, indicating that the star inside is young.