084082

The LMC hosts the giant HII region 30 Doradus and the very massive stellar cluster R136. Observations suggest that a collision of large HI structures has triggered the formation of R136. The ROSAT LMC survey revealed a large diffuse structure extending from 30 Dor to the south comma called the X-ray spur comma which fills about 1-20 of the LMC and emits soft thermal X-rays. It seems to be located between the colliding HI gas comma with the western edge coinciding with the location where the HI components meet. We propose observations of the X-ray spur with XMM-Newton to study the hot plasma with the aim to understand whether colliding large gas structures can trigger the formation of very massive stars and the heating of such a large part of the ISM.

大麦哲伦云（Large Magellanic Cloud，LMC）拥有巨型电离氢区（H II region）剑鱼座30（30 Doradus）以及质量极大的恒星团R136。观测结果表明，大型中性氢（neutral hydrogen，HI）结构的碰撞触发了R136星团的形成。伦琴X射线天文台（ROSAT）的大麦哲伦云巡天观测发现了一处大型弥散结构，其延展范围覆盖剑鱼座30以南区域，被命名为X射线脊（X-ray spur），该结构占据了大麦哲伦云约1%~20%的天区，并辐射软热X射线。该结构似乎位于碰撞的中性氢气体之间，其西缘与中性氢组分的交汇位置完全重合。我们提议使用XMM-牛顿卫星（XMM-Newton）对该X射线脊开展观测，以研究其中的热等离子体，旨在探明大型气体结构的碰撞是否能够触发大质量恒星的形成，并揭示此类大范围星际介质（Interstellar Medium，ISM）区域的加热机制。