Revisiting the Evidence for an Intermediate-mass Black Hole in the Center of NGC 6624 with Simulations

作     者：Li-Chun Wang Yi Xie Li-Chun Wang;Yi Xie

作者机构：School of ScienceJimei UniversityXiamen 361021China Physics Experiment CenterJimei UniversityXiamen 361021China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2022年第22卷第11期

页      面：78-83页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.11803009 and 11603009 the Natural Science Foundation of Fujian Province under Grant Nos.2018J05006,2018J01416 and 2016J05013。 

主　　题：(stars:)pulsars:individual(J1823-3021A) (Galaxy:)globular clusters:individual(NGC 6624) stars:black holes 

摘      要：The acceleration of LMXB 4U 1820-30 derived from its orbital-period derivative P_(b)was supposed to be the evidence for an Intermediate-mass black hole(IMBH)in the Galactic globular cluster(GC)NGC 6624.However,we find that the anomalous P_(b)is mainly due to the gravitational wave emission,rather than the acceleration in cluster potential.Using the standard structure models of GCs,we simulate acceleration distributions for pulsars in the central region of the cluster.By fitting the acceleration of J1823-3021 A with the simulated distribution profiles(maximum values),it is suggested that an IMBH with mass M■950_(-350)^(+550)M_(⊙) may reside in the cluster center.We further show that the second period derivative P of J1823-3021 A is probably due to the gravitational perturbation of a nearby star.