arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2302.07284astro-ph.HE
收藏

GW191109及具有负有效自旋的双黑洞并合的可能动力学起源

On the Likely Dynamical Origin of GW191109 and of Binary Black Hole Mergers with Negative Effective Spin

Rachel C. Zhang, Giacomo Fragione, Chase Kimball, Vicky Kalogera

AI总结:

本文研究了难以用孤立双星演化解释的负有效自旋双黑洞并合事件,证明在致密星团中动力学组装且含第二代黑洞的系统能自然重现GW191109等事件的观测特征。

摘要:

随着LIGO/Virgo/KAGRA探测到的双黑洞(BBH)并合数量不断增加,一些系统已难以通过孤立双星演化来解释,它们具有处于对不稳定质量间隙中的组件、高轨道偏心率和/或自旋轨道失配。在此,我们重点关注GW191109_010717,这是一个组件质量为$65^{+11}_{-11}$和$47^{+15}_{-13}$ $\rm M_{\odot}$、有效自旋为$-0.29^{+0.42}_{-0.31}$的BBH并合,这可能意味着其至少一个组件的自旋轨道失配超过$\pi/2$弧度。除了其组件质量处于对不稳定质量间隙中,我们还表明孤立双星演化不太可能高置信度地重现GW191109所提出的自旋轨道失配。另一方面,我们证明在致密星团中动力学组装的BBH会自然重现GW191109的自旋轨道失配和质量,以及类GW191109事件的发生率,前提是至少一个组件为第二代黑洞。最后,我们将结果推广至所有测量到负有效自旋的事件,论证GW200225同样具有可能的动力学起源。

英文摘要:

With the growing number of binary black hole (BBH) mergers detected by LIGO/Virgo/KAGRA, several systems have become difficult to explain via isolated binary evolution, having components in the pair-instability mass gap, high orbital eccentricities, and/or spin-orbit misalignment. Here, we focus on GW191109\_010717, a BBH merger with component masses of $65^{+11}_{-11}$ and $47^{+15}_{-13}$ $\rm M_{\odot}$, and effective spin $-0.29^{+0.42}_{-0.31}$, which could imply a spin-orbit misalignment of more than $π/2$ radians for at least one of its components. Besides its component masses being in the pair-instability mass gap, we show that isolated binary evolution is unlikely to reproduce the proposed spin-orbit misalignment of GW191109 with high confidence. On the other hand, we demonstrate that BBHs dynamically assembled in dense star clusters would naturally reproduce the spin-orbit misalignment and the masses of GW191109, and the rates of GW191109-like events, if at least one of the components were to be a second-generation BH. Finally, we generalize our results to all the events with a measured negative effective spin, arguing that GW200225 also has a likely dynamical origin.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑