论文标题
并非所有的峰都相等：超级质量黑洞的早期生长
Not all peaks are created equal: the early growth of Supermassive Black Holes
论文作者
论文摘要
在这项工作中，我们使用受约束的高斯实现技术来研究宇宙学流体动力模拟中超大质量黑洞（SMBHS）的早期生长，探索了其与大规模的初始密度峰的关系，〜1 mpc/h。我们对体积（20 MPC/H）^3的限制模拟成功地重建了大规模结构，以及在Z〜7时在蓝图模拟中发现的稀有10^9 MSBHS的宿主的黑洞生长。我们通过在r_g = 1 mpc/h的尺度上施加5σ_0（r_g）峰来运行一组具有约束初始条件的模拟，以改变不同的峰值特征，例如形状和紧凑性以及峰周围的潮汐场。我们发现，初始密度峰值高，潮汐峰值高，潮汐场低，从而诱导早期时代最快的BH生长。这是因为紧凑型密度峰具有更大的大规模物质分布，导致在光晕中心形成高密度气体团块，从而增强早期BH积聚。此外，低潮汐场区域的这种最初紧凑的密度峰也导致了更紧凑的BH宿主星系形态。这可以解释在观测中看到的BH生长与宿主星系紧凑度之间的紧密相关性。
In this work, we use the constrained Gaussian realization technique to study the early growth of supermassive black holes (SMBHs) in cosmological hydrodynamic simulations, exploring its relationship with features of the initial density peaks on large scales, ~1 Mpc/h. Our constrained simulations of volume (20 Mpc/h)^3 successfully reconstruct the large-scale structure as well as the black hole growth for the hosts of the rare 10^9 Msun SMBHs found in the BlueTides simulation at z~7. We run a set of simulations with constrained initial conditions by imposing a 5 σ_0(R_G) peak on scale of R_G = 1 Mpc/h varying different peak features, such as the shape and compactness as well as the tidal field surrounding the peak. We find that initial density peaks with high compactness and low tidal field induce the most rapid BH growth at early epochs. This is because compact density peaks with a more spherical large scale matter distribution lead to the formation of high density gas clumps in the centers of halos, and thus boost early BH accretion. Moreover, such initially compact density peaks in low tidal field regions also lead to a more compact BH host galaxy morphology. This can explain the tight correlation between BH growth and host galaxy compactness seen in observations.
