超新星遗迹与绿色延展天体的相互关系

Connection between SNRs and EGOs

超新星遗迹是超新星爆发后的残留物,包含爆发喷射物以及周围与其相互作用的物质;绿色延展天体是大质量恒星形成区候选体.这两类天体都与大质量恒星的形成与死亡有密切关系.本文尝试探究超新星遗迹与绿色延展天体的相互关系,以期对超新星是否促进大质量恒星形成这一问题有进一步了解.本研究通过计算得到14组超新星遗迹和绿色延展天体的相对距离,发现最小的也在百秒差距量级.通过分析274个超新星遗迹与298个绿色延展天体的空间分布,发现相对于其他区域,超新星遗迹附近的绿色延展天体明显多一些,但可能是因为超新星遗迹附近分子云密度大造成.斯必泽红外空间望远镜的巡天范围在银纬b=±1°内,在此范围以外的超新星遗迹附近的绿色延展天体是使用美国宇航局广角红外巡天探测器(WISE)巡天数据搜寻的,找到了4个绿色延展天体.得到的初步结论是超新星遗迹并不能直接促使绿色延展天体形成,但它们之间或许有间接联系.

To understand the formation of massive stars,we explored the connection between Supernova Remnants(SNRs)and Extended Green Objects(EGOs).A supernova usually interacts with its surroundings then produces a SNR,while an EGO,named for the 4.5um excess which is coded as green in three-color composite Infrared Array Camera images of the Spitzer Space Telescope,is the star-bed of the young massive stars.To check whether SNRs enhance formation of massive stars,the relative distances between SNRs and EGOs were calculated.It was found that the shortest distance was about 100 pc,which is too far for interactions to occur.The space distribution analysis was done for 274 SNRs and 289 EGOs.It was found that SNRs and EGOs gather together in some regions of the Galactic plane,mainly due to a selection effect.Most EGOs are discovered by Spitzer Space Telescope because of its high resolution,with the Spitzer Galactic Plane Survey it is b=±1°.Thus,using WISE data,we searched for other EGOs nearest SNRs outside b=±1°and found four EGO candidates.It is concluded that SNRs cannot directly give rise to the formation of massive stars,but there might exist some indirect connection among them via molecular clouds.