HC_(3)N,另一种激波示踪分子?  

HC_(3)N,another shock tracing molecule?

作　　者：张江水[1] 汪友鑫 陈家梁[1] 赵洁瑜 邹益鹏 ZHANG Jiang-shui;WANG You-xing;CHEN Jia-liang;ZHAO Jie-yu;ZOU Yi-peng(Center for Astrophysics,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学天体物理中心,广东广州510006

出　　处：《广州大学学报（自然科学版）》2022年第4期87-93,共7页Journal of Guangzhou University:Natural Science Edition

摘　　要：激波,即冲击波,与恒星形成演化过程密切相关。目前,已知的激波示踪分子主要有氧化硅(SiO)、氧化硫(SO)和异氰酸(HNCO)。最近的研究表明,恒星形成区中HC_(3)N的形成可能与激波有关。为了检验HC_(3)N是否可以作为激波的示踪分子,使用IRAM望远镜对21个大质量恒星形成区的HC_(3)N J=12-11和SiO J=5-4进行了观测。对观测资料处理分析,发现在所有源中都探测到了HC_(3)N J=12-11,在12个源中探测到SiO J=5-4谱线。和SiO分子谱线一样,绝大多数源(16个)的HC_(3)N J=12-11谱线也显示出明显的线翼特征。对HC_(3)N J=12-11有明显线翼的源进一步分析显示,HC_(3)N确实存在于恒星形成活动活跃的区域。通过分析HC_(3)N J=12-11和SiO J=5-4的积分强度的相关性,发现这两种分子参数具有显著的正相关(相关系数r=0.86)。观测分析结果支持HC_(3)N为另外一种高速激波的示踪分子。Shock waves are closely connected with star formation and evolution.So far,the known tracing molecules of shock waves include silicon monoxide(SiO),suflur monoxide(SO)and isocyanic acid(HNCO).Recent studies suggest that the formation of HC_(3)N may also be associated with shock waves.To investigate whether HC_(3)N can be a tracer of shock waves,we used the IRAM 30m telescope to observe HC_(3)N J=12-11 and SiO J=5-4 toward 21 high-mass star-forming regions.Our analysis results on observation data show that,SiO J=5-4 was detected in 12 sources and HC_(3)N J=12-11 was detected in all 21 sources.As all detected SiO J=5-4 spectra,line wings appear clearly in most of the HC_(3)N J=12-11 spectra(16 out of 21).Investigations on those sources with line wing features found that HC_(3)N molecules are really existing in regions where star formation is active.Further,statistical analysis on the integrated intensities of HC_(3)N J=12-11 and SiO J=5-4 shows a significant positive correlation,with a correlation coefficient of 0.86.All of these results support that HC_(3)N can be used as another tracing molecule of the high-speed shock waves.

关 键 词：天体化学 星际介质 激波 HC_(3)N 

分 类 号：P148[天文地球—天体物理]