摘要
NGC 3603是位于银河系船底座旋臂上的一个致密年轻星团。星团中大质量恒星的星风向外输出机械能,改变周围介质的性质,在星系内恒星的形成以及星系的演化过程中起着重要的作用。大质量恒星形成区的X射线辐射来源于其中的前主序星、OB星,以及弥漫热气体等。上述3种来源的辐射机制在文中得到了综述;并且,NGC 3603中的点源和弥漫热气体的X射线辐射的性质在文中也得以介绍;最后,基于Chandra 0.5 Ms档案数据的研究工作被予以简要的展望。
NGC 3603 is a dense young cluster located in the Carina spiral arm of the Milky Way. The mechanical energy released by the winds from massive stars alters the property of the ambient medium, and has very important influences on the star formation and the galaxy evolution process. The X-ray emission in massive star formation region is produced by the pre-main sequence star, OB star, and diffuse hot gas etc. In this paper, we reviewed the X-ray radiation mechanisms of those three kinds of sources and presented the X-ray radiation of point sources and diffuse hot gas in NGC 3603, respectively. For the point sources, Moffat et al.（2002） detected the X-rays from 43 early-type sources, and found that they follow the canonical relationship between the X-ray luminosity and the bolometricluminosity： LX/Lbol-10^-7. They also found that MTT 68 and MTT 71, two O stars far away from the core region, have enhanced X-ray emission： L X/L bol- 10^-5. For the diffuse emission, Townsley et al.（2011） found that the diffuse plasma in NGC 3603 is in nonequilibrium state. Ji et al.（2006） fitted the diffuse X-rays in the central annulus region with the 1-D self-consistent non-equilibrium ionization cluster wind model, and determined related stellar wind parameters. Besides that, they both found that the X-rays from un-resolved pre-main sequence stars contribute - 10% in total X-ray luminosity. The prospect of X-ray research on NGC 3603 based on the archival 0.5 Ms Chandra observation is also discussed in the end.
出处
《天文学进展》
CSCD
北大核心
2017年第1期1-15,共15页
Progress In Astronomy
基金
国家自然科学基金(11250110059)
江苏省博士后科研资助(1501049C)
中国科学院百人计划
关键词
年轻星团
X射线
NGC
3603
前主序星
非电离平衡
Young star cluster
X-ray
NGC 3603
pre-main sequence star
non-equilibrium ionization
