Infalling clouds on to supermassive black hole binaries - I. Formation of discs, accretion and gas dynamics
Infalling clouds on to supermassive black hole binaries - I. Formation of discs, accretion and gas dynamics
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DOI：
10.1093/mnras/stv2470
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发表时间：
2015-07
影响因子：
4.8
通讯作者：
F. Goicovic;F. Goicovic;Jorge Cuadra;A. Sesana;A. Sesana;F. Stasyszyn;P. Amaro-Seoane;Takamitsu L. Tanaka
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文献类型：
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作者：
F. Goicovic;F. Goicovic;Jorge Cuadra;A. Sesana;A. Sesana;F. Stasyszyn;P. Amaro-Seoane;Takamitsu L. Tanaka
有令人信服的证据表明，大多数（如果不是全部）星系的核心都存在超大质量黑洞（SMBH），因此这些大质量天体的双星是宇宙结构分层演化的必然产物，代表着星系演化的一个重要但迄今为止难以捉摸的阶段。人们认为，通过环双星盘的气体吸积对于SMBH双星的动态演化以及产生可用于推断其性质的发光发射非常重要。气体燃料的一种可能来源是由于星际介质中的湍流和重力不稳定而形成的气体团，这些气体随后落向双星系统并与之相互作用。在这种情况下，我们使用 SPH 代码 GADGET-3 的修改版本，对等质量 SMBH 双星近径向坠落中的湍流云的演化进行数值模拟。我们总共提出了 12 个模拟，探索不同可能的近心距离和相对倾角，并表明环绕双星盘和每个SMBH（“迷你盘”）周围盘的形成取决于这些参数。我们还研究了形成的圆盘的动力学，以及不同配置中SMBH的进料速率的变化。
There is compelling evidence that most -if not all- galaxies harbour a super-massive black hole (SMBH) at their nucleus, hence binaries of these massive objects are an inevitable product of the hierarchical evolution of structures in the universe, and represent an important but thus-far elusive phase of galaxy evolution. Gas accretion via a circumbinary disc is thought to be important for the dynamical evolution of SMBH binaries, as well as in producing luminous emission that can be used to infer their properties. One plausible source of the gaseous fuel is clumps of gas formed due to turbulence and gravitational instabilities in the interstellar medium, that later fall toward and interact with the binary. In this context, we model numerically the evolution of turbulent clouds in near-radial infall onto equal-mass SMBH binaries, using a modified version of the SPH code GADGET-3. We present a total of 12 simulations that explore different possible pericentre distances and relative inclinations, and show that the formation of circumbinary discs and discs around each SMBH ('mini-discs') depend on those parameters. We also study the dynamics of the formed discs, and the variability of the feeding rate onto the SMBHs in the different configurations.