电离氢区S187的大尺度CO多谱线观测  

Large-scale CO Multi-line Observations of the S187 HII Region

作　　者：徐小云 陈学鹏[1,2] 张世瑜 孙燕 XU Xiao-yun;CHEN Xue-peng;ZHANG Shi-yu;SUN Yan(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026)

机构地区：[1]中国科学院紫金山天文台,南京210023 [2]中国科学技术大学天文与空间科学学院,合肥230026

出　　处：《天文学报》2024年第5期1-36,共36页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(12041305);国家重点研发计划(2023YFA1608000、2017YFA0402701);中国科学院前沿科学重点研究计划(QYZDJ-SSW-SLH047);中国科学院青年创新促进会优秀会员(Y2022085);中国科学院“西部之光”人才培养计划(xbzg-zdsys-202212);新疆维吾尔自治区“天池英才”项目资助。

摘　　要：大质量恒星强烈的反馈深刻影响其周围的星际介质,并可能触发下一代恒星形成.S187是位于银河系第2象限的大质量恒星形成区,呈现出“扫集-坍缩”的触发式恒星形成模式.基于“银河画卷”巡天^(12)CO/^(13)CO/C^(18)O(J=1-0,下文J=1-0为简便起见省略)谱线数据,对S187区域分子云的基本性质开展了研究,探索了该区域大质量恒星对分子云的反馈.利用GaussPy+和聚类算法,在该区域证认了32个分子云,并结合Gaia(Global Astrometric Interferometer for Astrophysics)卫星恒星消光数据测量得到其中8个分子云的距离.S187区域由^(13)CO和C^(18)O示踪的相对致密的气体含量相比于银道面第2象限大部分区域的分子云高出1–2个量级.S187区域分子云中证认了243个^(13)CO团块和98个C^(18)O团块,其中有7个^(13)CO团块和5个C^(18)O团块有形成大质量恒星的潜力.研究结果显示,大质量恒星的反馈对其周围分子云的聚集作用明显,为下一代大质量恒星的形成提供了条件.The strong feedback of massive stars profoundly affects the interstellar medium around them,and may trigger the formation of next-generation stars.S187 is a massive star formation region located in the second quadrant of the Milky Way,showing a“Collect and Collapse”triggered star formation pattern.Based on the ^(12)CO/^(13)CO/C^(18)O(J=1-0,following J=1-0 is omitted for simplicity)spectra line data from the Milky Way Imaging Scroll Painting(MWISP)survey,the basic properties of the molecular cloud in the S187 region were studied,and the feedback of massive stars to molecular cloud was explored.Using GaussPy+and clustering algorithm,32 clouds were identified in this region,and the distances of eight of them were measured by combining the star extinction data of Gaia(Global Astrometric Interferometer for Astrophysics)satellite.The relatively dense gas content traced by ^(13)CO and C^(18)O in S187 region is 1-2 orders of magnitude higher than that of molecular clouds in most regions of the second quadrant of the galactic plane.In the S187 region,243^(13)CO and 98 C^(18)O clumps were identified,among which 7^(13)CO and 5 C^(18)O clumps had the potential to form massive stars.The results show that the feedback of massive stars has an obvious effect on the aggregation of molecular cloud around them,which provides conditions for the formation of the next-generation of massive stars.

关 键 词：星际介质:云 星际介质:电离氢区 恒星:形成 射电谱线:星际介质 星际介质:个别:S187 

分 类 号：P155[天文地球—天文学]