论文标题
密集的恒星簇中的毫秒脉冲星：进化，比例关系和银河系伽马射线过量
Millisecond Pulsars in Dense Star Clusters: Evolution, Scaling Relations, and the Galactic-Center Gamma-ray Excess
论文作者
论文摘要
近年来，以银河系观察到的毫秒脉冲星（MSP）的数量增加了爆炸性，但由于观察到的偏见，基础种群仍然不确定。我们使用最先进的$ n $ body模拟来研究密集的星团中MSP种群的演变。这些聚类模型在初始条件下占据广泛的范围，包括不同的初始质量，金属性和病毒半径，它们几乎涵盖了银色群集中的全部属性。我们证明了不同的初始簇特性如何影响MSP的数量，我们为此提供了比例关系，这是群集年龄和质量的函数。作为应用程序，我们使用公式来估计从灵感的球状簇传递到银河中心的MSP数量，以探测Fermi检测到的银河系中心伽马射线过量的原点。我们预测，球状簇中断的银河中心中的MSP约为400美元，这可能会解释大多数观察到的伽马射线过量。
The number of millisecond pulsars (MSPs) observed in Milky Way globular clusters has increased explosively in recent years, but the underlying population is still uncertain due to observational biases. We use state-of-the-art $N$-body simulations to study the evolution of MSP populations in dense star clusters. These cluster models span a wide range in initial conditions, including different initial masses, metallicities, and virial radii, which nearly cover the full range of properties exhibited by the population of globular clusters in the Milky Way. We demonstrate how different initial cluster properties affect the number of MSPs, for which we provide scaling relations as a function of cluster age and mass. As an application, we use our formulae to estimate the number of MSPs delivered to the Galactic Center from inspiralling globular clusters to probe the origin of the Galactic-Center gamma-ray excess detected by Fermi. We predict about $400$ MSPs in the Galactic Center from disrupted globular clusters, which can potentially explain most of the observed gamma-ray excess.
