Recently, Vitral & Mamon detected a central concentration of dark objects in the core-collapsed globular cluster NGC 6397, which could be interpreted as a subcluster of stellar-mass black holes. However, it is well established theoretically that any significant number of black holes in the cluster would provide strong dynamical heating and is fundamentally inconsistent with this cluster's core-collapsed profile. Claims of intermediate-mass black holes in core-collapsed clusters should similarly be treated with suspicion, for reasons that have been understood theoretically for many decades. Instead, the central dark population in NGC 6397 is exactly accounted for by a compact subsystem of white dwarfs (WDs), as we demonstrate here by inspection of a previously published model that provides a good fit to this cluster. These central WD subclusters are in fact a generic feature of core-collapsed clusters, while central black hole subclusters are present in all non-collapsed clusters.

最近，Vitral & Mamon 在核心坍缩的球状星团 NGC 6397 中检测到了中心集中的暗物体，这可以被解释为恒星质量黑洞的子星团。然而，理论上已经确定，星团中任何大量的黑洞都会提供强烈的动态加热，并且与该星团的核心坍缩剖面根本不一致。对于核心坍缩星团中的中等质量黑洞的说法，同样应受到怀疑，其原因在理论上已被理解了数十年。相反，NGC 6397 中的中央暗星群完全由一个紧凑的白矮星子系统 (WDs) 来解释，正如我们在此通过检查先前发布的模型来证明的那样，该模型很好地拟合了这个星团。非折叠集群。