大麦哲伦云超泡30 Doradus C研究进展  

Current Investigation on Superbubble 30 Doradus C in the Large Magellanic Cloud

作　　者：陈晗晓 池奕恒 蒙怡帆 陈阳[1,2] 周平 孙磊[1,2] 孙玮 CHEN Han-xiao;CHI Yi-heng;MENG Yi-fan;CHEN Yang;ZHOU Ping;SUN Lei;SUN Wei(School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China;Key Laboratory of Modern Astronomy and Astrophysics,Nanjing University,Nanjing 210023,China;Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China;Key Laboratory of Dark Matter and Space Astronomy,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]南京大学天文与空间科学学院,南京210023 [2]南京大学现代天文与天体物理重点实验室,南京210023 [3]中国科学院紫金山天文台,南京210008 [4]中国科学院暗物质与空间科学重点实验室,南京210008

出　　处：《天文学进展》2024年第1期26-39,共14页Progress In Astronomy

基　　金：国家自然科学基金面上项目(12273010);国家自然科学基金创新群体项目(12121003);国家自然科学基金青年学生项目(123B1021)。

摘　　要：超泡是由OB星协中大质量恒星星风或/及超新星爆炸驱动而产生的带壳层的巨型泡状星际介质结构,在多个波段都有明显的发射特征,是研究天体辐射机制的重要场所。30 DorC是大麦哲伦云中唯一已观测到明显非热辐射的超泡,非热辐射覆盖了整个超泡区域且在壳层处最显著,是大麦哲伦云中结构最大的非热辐射源。回顾与总结了截至目前天文学界对30 DorC的研究成果,介绍了超泡内展源的基本情况,包括X射线热辐射、非热辐射以及其他波段的结果,同时对超泡内部已发现的点源信息做了整理,并讨论了超泡30 DorC内粒子加速的证据、可能的粒子加速机制、超泡形成原因等热点问题。Superbubbles are large shell-like interstellar medium structures formed by stellar winds from massive stars and supernovae.With obvious emission signatures in multiple wavelengths,superbubbles are important sites for studying the radiation mechanisms.30 Doradus C(30 DorC in short)is located southwest of 30 Dor in the Large Magellanic Cloud.Its location is basically consistent with OB association LH 90,suggesting that this superbubble may have been created by it.Since 30 DorC was detected in X-ray band by Einstein satellite in 1981,its X-ray emission has been observed and studied for many years.30 DorC is the only superbubble dominated by non-thermal emission in the Large Magellanic Cloud and it’s also the largest non-thermal X-ray emission source in the Local Group.The nonthermal emission covers the entire region of the superbubble and is most significant at the shell.Such bright non-thermal emission may due to particle acceleration in the superbubble,and to find out the evidence,the magnetic field conditions in the superbubble and radiation in other bands have also been studied.Compared to non-thermal emission,thermal emission in 30 DorC is relatively faint.Most of the thermal emission is detected in the eastern region of 30 Dor C,and there are also a supernova remnant found outside the southeast of the shell.In recent years,with the advancement of radio observation,the study of molecular clouds of 30 DorC has also increased.This paper reviews and summarizes the research of 30 DorC up to now.The basic situation of thermal emission,non-thermal emission and other bands are discussed first.Meanwhile,a summary is provided on the point sources discovered inside the superbubble.The evidence of particle acceleration inside 30 DorC is discussed according to the radiation situation,as well as current particle acceleration models and the formation reasons of 30 Dor C.

关 键 词：超泡 大麦哲伦云 星际介质 

分 类 号：P145.3[天文地球—天体物理]