标题： 球状星团中存在中等质量黑洞：没有基于质量分选的候选体 显示英文标题

标题： Globular clusters hosting intermediate-mass black-holes: no mass-segregation based candidates

摘要： 最近，对银河系球状星团（GCs）相对较大的样本中，恒星质量分选和二进制分数都被统一测量了。 模拟显示，可观的双星种群和中等质量黑洞（IMBHs）会抑制放松的球状星团中的质量分选。 因此，在具有可靠二进制分数测量的球状星团中，质量分选是一个有价值的探针，用于限制IMBHs。 在本文中，我们将文献中的质量分选和二进制分数测量结合起来，构建了一个33个GCs的样本（具有测量的核心二进制分数），以及一个43个GCs的样本（在核心半径和半质量半径之间的区域具有二进制分数测量）。 在这两个样本中，我们试图识别IMBH宿主候选者。 这些候选者应具有相对较低的质量分选、低二进制分数（<5%）和较短（<1 Gyr）的放松时间。 考虑到核心二进制分数样本，没有合适的候选者出现。 如果考虑核心和半质量半径之间的二进制分数，则发现了两个候选者，但这可能是由于统计波动。 我们还考虑了一个更大的54个GCs的样本，在其中我们使用基于金属量和积分绝对亮度的预测关系估计了核心二进制分数。 在这种情况下也没有找到合适的候选者。 最后，我们考虑了球状星团的核心与半质量半径比，该比值对于包含IMBH或双星的球状星团来说应该更大。 我们发现核心与半质量半径比大的球状星团质量分选较少（并且显示出较大的二进制分数），这证实了理论预期，即导致大核心的能量来源也在抑制质量分选。 显示英文摘要

摘要： Recently, both stellar mass-segregation and binary-fractions were uniformly measured on relatively large samples of Galactic Globular Clusters (GCs). Simulations show that both sizeable binary-star populations and Intermediate-Mass Black Holes (IMBHs) quench mass-segregation in relaxed GCs. Thus mass-segregation in GCs with a reliable binary-fraction measurement is a valuable probe to constrain IMBHs. In this paper we combine mass-segregation and binary-fraction measurements from the literature to build a sample of 33 GCs (with measured core-binary fractions), and a sample of 43 GCs (with a binary fraction measurement in the area between the core radius and the half-mass radius). Within both samples we try to identify IMBH-host candidates. These should have relatively low mass-segregation, a low binary fraction (< 5%), and short (< 1 Gyr) relaxation time. Considering the core binary fraction sample, no suitable candidates emerge. If the binary fraction between the core and the half-mass radius is considered, two candidates are found, but this is likely due to statistical fluctuations. We also consider a larger sample of 54 GCs where we obtained an estimate of the core binary fraction using a predictive relation based on metallicity and integrated absolute magnitude. Also in this case no suitable candidates are found. Finally, we consider the GC core- to half-mass radius ratio, that is expected to be larger for GCs containing either an IMBH or binaries. We find that GCs with large core- to half-mass radius ratios are less mass-segregated (and show a larger binary fraction), confirming the theoretical expectation that the energy sources responsible for the large core are also quenching mass-segregation