论文标题
辐射反馈对云云碰撞期间球状簇候选的形成的影响
Impact of Radiation Feedback on the Formation of Globular Cluster Candidates during Cloud-Cloud Collisions
论文作者
论文摘要
为了理解在球状簇（GC）形成过程中辐射反馈的影响，我们模拟了两个湍流巨型分子云（GMC）的正面碰撞。进行了一系列理想化的辐射流动力模拟，具有和没有恒星辐射或II型超新星。我们发现，在$ \ 3 \ 3 \ 3 \，{\ rm myr} $中，当两个带有质量$ M _ {\ rm gmc} \ rm gmc} = 3.6 \ coll的gmcs时，有重力绑定的，紧凑的星团质量$ m _ {\ rm gc} \ sim 10^5 \，m_ \ odot $ forms $ \ odot $表格，{\ rm myr} $ colt y时，{\ rm myr} $。 GC候选者在一次崩溃的事件中不会形成，而是由于局部密集的气体团块和气体积聚而出现的。由于电离辐射的吸收而引起的动量转移是一旦有足够数量的恒星形成，抑制气体崩溃和光电离的主要反馈过程就变得有效。当忽略辐射反馈时，群集质量的较大，而$ \ sim 2 $的质量较大，当在基准运行中考虑了极端$ \ rmlyα$反馈时，差异稍微更为明显（16 \％）。在带有辐射反馈的模拟中，超新星分散后，超新星爆炸了，其金属喷射不会瞬时回收到形成恒星。
To understand the impact of radiation feedback during the formation of a globular cluster (GC), we simulate a head-on collision of two turbulent giant molecular clouds (GMCs). A series of idealized radiation-hydrodynamic simulations is performed, with and without stellar radiation or Type II supernovae. We find that a gravitationally bound, compact star cluster of mass $M_{\rm GC} \sim 10^5\,M_\odot$ forms within $\approx 3\,{\rm Myr}$ when two GMCs with mass $M_{\rm GMC}=3.6\times10^5\,M_\odot$ collide. The GC candidate does not form during a single collapsing event but emerges due to the mergers of local dense gas clumps and gas accretion. The momentum transfer due to the absorption of the ionizing radiation is the dominant feedback process that suppresses the gas collapse and photoionization becomes efficient once a sufficient number of stars form. The cluster mass is larger by a factor of $\sim 2$ when the radiation feedback is neglected, and the difference is slightly more pronounced (16\%) when extreme $\rm Lyα$ feedback is considered in the fiducial run. In the simulations with radiation feedback, supernovae explode after the star-forming clouds are dispersed, and their metal ejecta are not instantaneously recycled to form stars.
