论文标题
碰撞速度，云密度和湍流在通过云云碰撞中形成年轻大型集群中的作用
The role of collision speed, cloud density, and turbulence in the formation of young massive clusters via cloud-cloud collisions
论文作者
论文摘要
年轻的大型集群（YMC）最近形成了具有异常高的恒星形成速率的天文物体。我们提出，巨型分子云（GMC）的碰撞是YMC的可能形成机制，与其他作者结束的YMC传送带形成模式一致。我们对云云碰撞进行了平滑的粒子流体动力学模拟，并探讨了云的碰撞速度，初始云密度以及云湍流水平对全球恒星形成速率的水平以及由碰撞形成的簇的性能。我们表明，较高的碰撞速度，更高的初始云密度和较低的湍流会增加总体恒星形成率，并以更大的簇质量产生簇。通常，与相对速度$ \ gtrsim 25 $ km/s的碰撞，初始云密度$ \ gtrsim 250 $ cm $^{ - 3} $，$ \ $ \的湍流约2.5 $ km/s可以产生庞大的群集，其物业与观察到的机动YMC相似。
Young massive clusters (YMCs) are recently formed astronomical objects with unusually high star formation rates. We propose the collision of giant molecular clouds (GMCs) as a likely formation mechanism of YMCs, consistent with the YMC conveyor-belt formation mode concluded by other authors. We conducted smoothed particle hydrodynamical simulations of cloud-cloud collisions and explored the effect of the clouds' collision speed, initial cloud density, and the level of cloud turbulence on the global star formation rate and the properties of the clusters formed from the collision. We show that greater collision speed, greater initial cloud density and lower turbulence increase the overall star formation rate and produce clusters with greater cluster mass. In general, collisions with relative velocity $\gtrsim 25$ km/s, initial cloud density $\gtrsim 250$ cm$^{-3}$, and turbulence of $\approx 2.5$ km/s can produce massive clusters with properties resembling the observed Milky Way YMCs.
