Predicting the binary black hole population of the Milky Way with cosmological simulations
Predicting the binary black hole population of the Milky Way with cosmological simulations
复制标题
DOI：
10.1093/mnras/sty2035
复制
发表时间：
2018-01
影响因子：
4.8
通讯作者：
A. Lamberts;S. Garrison-Kimmel;P. Hopkins;E. Quataert;J. Bullock;C. Faucher-Giguère;A. Wetzel;
中科院分区：
文献类型：
--
作者：
A. Lamberts;S. Garrison-Kimmel;P. Hopkins;E. Quataert;J. Bullock;C. Faucher-Giguère;A. Wetzel;
作者(S)：兰贝茨，A；加里森-基梅尔，S；霍普金斯，PF；夸塔尔特，E；布洛克，JS；福彻-吉盖尔，加利福尼亚州；韦策尔，A；克雷斯，D；兰戈，K；桑德森，RE|摘要：©2018作者(S)。双星黑洞是大质量恒星的主要终点。它们的性质为限制二元进化提供了一个独特的机会，这一点仍然知之甚少。我们预测了银河系内部/周围双星黑洞及其合并产物的主要性质。在此背景下，我们首次提出了银河系-质量星系的高分辨率宇宙学模拟与二元人口合成模型的结合。来自FIRE项目的流体动力学模拟，提供了该星系、其恒星晕和卫星的宇宙逼真的恒星形成历史。在后处理过程中，我们将金属丰度相关的演化模型应用于恒星粒子，以产生单独的双星黑洞。我们发现在银河系模型中已经合并了7×10~5个双星黑洞，仍然存在1.2×10~6个双星黑洞，平均质量为28m⊙。由于黑洞前体强烈偏向低金属丰度恒星，其中一半位于星晕和卫星中，三分之一是在主星系之外形成的。合并系统的数量和质量分布与LIGO/处女座的探测大体兼容。我们的简化双星演化模型预测，LISA将探测到20多个双星黑洞，但电磁观测将是具有挑战性的。我们的方法将基于对致密天体的观测和对不同双星演化模型的预测之间的比较，来限制大质量双星的演化。我们提供了我们的恒星形成模型和双星黑洞分布的在线数据。
Author(s): Lamberts, A; Garrison-Kimmel, S; Hopkins, PF; Quataert, E; Bullock, JS; Faucher-Giguere, CA; Wetzel, A; Keres, D; Drango, K; Sanderson, RE | Abstract: © 2018 The Author(s). Binary black holes are the primary endpoint of massive stars. Their properties provide a unique opportunity to constrain binary evolution, which remains poorly understood. We predict the main properties of binary black holes and their merger products in/around the Milky Way. We present the first combination of a high-resolution cosmological simulation of a Milky Way-mass galaxy with a binary population synthesis model in this context. The hydrodynamic simulation, taken from the FIRE project, provides a cosmologically realistic star formation history for the galaxy, its stellar halo, and satellites. During post-processing, we apply a metallicity-dependent evolutionary model to the star particles to produce individual binary black holes. We find that 7 × 105 binary black holes have merged in the model Milky Way, and 1.2 × 106 binaries are still present, with a mean mass of 28M⊙. Because the black hole progenitors are strongly biased towards low-metallicity stars, half reside in the stellar halo and satellites and a third were formed outside the main galaxy. The numbers and mass distribution of the merged systems is broadly compatible with the LIGO/Virgo detections. Our simplified binary evolution models predict that LISA will detect more than 20 binary black holes, but that electromagnetic observations will be challenging. Our method will allow for constraints on the evolution of massive binaries based on comparisons between observations of compact objects and the predictions of varying binary evolution models. We provide online data of our star formation model and binary black hole distribution.