Supermassive black holes, accretion discs, stellar dynamics and tidal disruptions

超大质量黑洞、吸积盘、恒星动力学和潮汐扰动

• 批准号: 233738862
• 负责人: Professor Dr. Pau Amaro-Seoane, Ph.D.
• 金额: --
• 依托单位: Max-Planck-Institut für Astronomie (MPIA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/233738862?language=en
• 关键词: Supermassive; black; holes; accretion; discs

Massive black holes exist at the centre of most, perhaps all galaxies. The masses of the black holes are very well correlated with the properties of their host galaxies, suggesting that the formation of both populations are linked. Moreover, galaxies form hierarchically, from the merger of smaller galaxies. I propose to study the fate of the black hole binaries (BBH) formed during galaxy mergers. I plan to answer whether the BBH merge or stall at sub-parsec separations. The research group will focus on (i) tidal disruptions of stars and (ii) the evolution of BBH in gas-rich environments, from parsec separations, but also until they reach the gravitational-wave-driven phase. We will calculate the rate tidal disruptions in the process and also of decay of the binary at different stages, depending on the thermodynamics of the surrounding gas, including the effect of the stars formed in this gas. Once the BBH reaches separations of the order of a hundred Schwarzschild radii, the orbit decays due to the emission of gravitational waves and the binary decouples from the disc. However, some gas is expected to remain bound to the black holes. We will study the evolution of this gas and predict the strength of its electromagnetic emission just before the BBH coalesce. This will increase the scientific output of its gravitational wave detection. We also plan on a post-processing of the simulations described above, to identify observational features that reveal the presence of BBHs. These predictions will be crucial in guiding electromagnetic searches for such systems in current and upcoming time-domain and spectral large-sky surveys. This would allow us to put stringent limits on the origin and evolution of the massive black hole population.

大质量黑洞存在于大多数，也许是所有星系的中心。黑洞的质量与其宿主星系的性质有很好的相关性，这表明两个种群的形成是相关的。此外，星系的形成是有等级的，是由较小的星系合并而成的。我建议研究星系合并期间形成的黑洞双星（BBH）的命运。我打算回答BBH是否合并或失速在sub-parsec分离。该研究小组将专注于（i）恒星的潮汐破坏和（ii）BBH在富含气体的环境中的演化，从秒差距分离，直到它们达到引力波驱动阶段。我们将根据周围气体的热力学，包括在这种气体中形成的恒星的影响，计算过程中的潮汐破裂率以及双星在不同阶段的衰变率。一旦BBH达到100史瓦西半径量级的分离，由于引力波的发射和来自圆盘的双星，轨道就会衰减。然而，一些气体预计将继续与黑洞结合。我们将研究这种气体的演化，并预测BBH合并之前的电磁辐射强度。这将增加其引力波探测的科学产出。我们还计划对上述模拟进行后处理，以确定揭示BBH存在的观测特征。这些预测将是至关重要的指导电磁搜索这样的系统在当前和即将到来的时域和光谱大天空调查。这将使我们能够严格限制大质量黑洞人口的起源和演化。

项目成果

Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence

块状冷气体吸积到大质量黑洞双星上：双星合并的可能快速途径

• DOI: 10.1093/mnras/sty1709
• 发表时间: 2018
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Goicovic;Felipe G;Maureira-Fredes;Cristian;Sesana;Alberto;Amaro-Seoane;Cuadra
• 通讯作者: Cuadra

GRAVIDY, a GPU modular, parallel direct-summation N-body integrator: Dynamics with softening

• DOI: 10.1093/mnras/stx2468
• 发表时间: 2017-02
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: C. Maureira-Fredes;P. Amaro-Seoane

Accretion of clumpy cold gas on to massive black hole binaries: the challenging formation of extended circumbinary structures

块状冷气体在大质量黑洞双星上的吸积：扩展的环绕双星结构的形成具有挑战性

• DOI: 10.1093/mnras/sty1105
• 发表时间: 2018
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Maureira-Fredes;Cristián;Goicovic;Felipe G;Amaro-Seoane;Sesana;Alberto
• 通讯作者: Alberto