论文标题
气体动力学摩擦作为AGN碟片中的二元形成机制
Gas dynamical friction as a binary formation mechanism in AGN discs
论文作者
论文摘要
在本文中，我们研究了气态动力学摩擦（DF）如何影响活跃银河核（AGN）圆盘中嵌入的恒星质量黑洞（SBHS）的运动。我们在附近的两个共同平面SBH的相互作用中执行3体积分，最初是超级质量黑洞（SMBH）周围的圆形轨道。我们发现DF可以促进在AGN光盘中形成重力结合的近二元二进制物，并且我们描述了发生这种捕获的影响参数的离散范围和AGN盘参数的离散范围。我们还报告了结合二进制文件的偏心率和旋转感（相对于背景AGN碟片的逆转或逆行）的趋势，这是初始相遇的影响参数的函数。虽然基于对气态摩擦的大致描述，但我们的结果表明，AGN碟片中的二进制形成应该是常见的，并且可能会产生术前和逆行，以及圆形和怪异的二进制文件。
In this paper, we study how gaseous dynamical friction (DF) affects the motion of fly-by stellar-mass black holes (sBHs) embedded in active galactic nucleus (AGN) discs. We perform 3-body integrations of the interaction of two co-planar sBHs in nearby, initially circular orbits around the supermassive black hole (SMBH). We find that DF can facilitate the formation of gravitationally bound near-Keplerian binaries in AGN discs, and we delineate the discrete ranges of impact parameters and AGN disc parameters for which such captures occur. We also report trends in the bound binaries' eccentricity and sense of rotation (prograde or retrograde with respect to the background AGN disc) as a function of the impact parameter of the initial encounter. While based on an approximate description of gaseous friction, our results suggest that binary formation in AGN discs should be common and may produce both prograde and retrograde, as well as both circular and eccentric binaries.
