标题： 星系中心周围存在大质量吸积盘时的恒星动力学。 I. 牛顿描述 显示英文标题

标题： Stellar dynamics in a galactic centre surrounded by a massive accretion disc. I. Newtonian description

摘要： 恒星轨道在巨大中心附近的长期演化被研究，以理解星系核心区域的星团核心。 恒星轨迹经历微小扰动，其来源有两个方面：(i) 围绕银河中心的薄气体盘的引力场，以及 (ii) 恒星与盘物质连续相互作用产生的累积阻力。 这两种效应密切相关，因为它们都依赖于盘的总质量，假设该质量是中心质量的一个小比例。 结果表明，与之前的研究不同，大多数相对于盘为逆行的轨道被中心物体捕获，该物体可能是大质量黑洞。 初始为顺行的轨道也受到影响，因此准平衡状态下中心星团的统计特性可能与之前分析得出的结果显著不同。 显示英文摘要

摘要： The long-term evolution of stellar orbits bound to a massive centre is studied in order to understand the cores of star clusters in central regions of galaxies. Stellar trajectories undergo tiny perturbation, the origin of which is twofold: (i) gravitational field of a thin gaseous disc surrounding the galactic centre, and (ii) cumulative drag due to successive interactions of the stars with material of the disc. Both effects are closely related because they depend on the total mass of the disc, assumed to be a small fraction of the central mass. It is shown that, in contrast to previous works, most of the retrograde (with respect to the disc) orbits are captured by the central object, presumably a massive black hole. Initially prograde orbits are also affected, so that statistical properties of the central star cluster in quasi-equilibrium may differ significantly from those deduced in previous analyses.