论文标题
大规模黑洞通过潮汐破坏的增长
Growth of A Massive Black Hole Via Tidal Disruption Accretion
论文作者
论文摘要
大规模黑洞（MBH）潮汐破坏的恒星可能会对MBH的生长产生重大贡献，尤其是在密集的核星团（NSC）中。然而，在大多数数值实验中，与气体积聚（GA）通道相比，恒星上的这种潮汐破坏积聚（TDA）在很大程度上被忽略了。在这项工作中，我们在高分辨率自适应网状改进代码enzo中通过TDA实施了黑洞增长通道，以研究其对MBH种子早期进化的影响。我们发现MBH种子从$ 10^3 \，\ Mathrm {M} _ \ odot $到$ \ gtrsim 10^6 \，\ Mathrm {m} _ \ odot $在200 \中，在某些测试的模拟中，Myrs in 200 \ in 200 \。与仅通过GA生长的MBH种子相比，TDA可以提高MBH的生长速度超过一个数量级。但是，正如预测的那样，TDA主要帮助MBH的早期增长（从$ 10^{3-4} \，\ Mathrm {M} _ \ odot $到$ \ simsim10^{5} \，\ \ mathrm {M Mathrm {M Mathrm {M} _ \ oDot $），而后期进化通常由GAIND do do hage。我们还观察到，当TDA最活跃时，MBH附近的恒星形成将被抑制，有时在MBH附近产生的气体（大小$ \ sim $）的气体（大小为$ \ sim $）。这是因为MBH可能会迅速使用GA和TDA生长，而大规模的MBH可以比通过气体流入补充的邻近气体更快地消耗其邻近气体。我们的研究表明，有必要考虑不同的黑洞积聚通道，这可能为高红移时存在超级质量黑洞的存在提供线索。
Stars that are tidally disrupted by the massive black hole (MBH) may contribute significantly to the growth of the MBH, especially in dense nuclear star clusters (NSCs). Yet, this tidal disruption accretion (TDA) of stars onto the MBH has largely been overlooked compared to the gas accretion (GA) channel in most numerical experiments until now. In this work, we implement a black hole growth channel via TDA in the high-resolution adaptive mesh refinement code Enzo to investigate its influence on a MBH seed's early evolution. We find that a MBH seed grows rapidly from $10^3\,\mathrm{M}_\odot$ to $\gtrsim 10^6\,\mathrm{M}_\odot$ in 200\,Myrs in some of the tested simulations. Compared to a MBH seed that grows only via GA, TDA can enhance the MBH's growth rate by up to more than an order of magnitude. However, as predicted, TDA mainly helps the early growth of the MBH (from $10^{3-4}\,\mathrm{M}_\odot$ to $\lesssim10^{5}\,\mathrm{M}_\odot$) while the later evolution is generally dominated by GA. We also observe that the star formation near the MBH is suppressed when TDA is most active, sometimes with a visible cavity in gas (of size $\sim$ a few pc) created in the vicinity of the MBH. It is because the MBH may grow expeditiously with both GA and TDA, and the massive MBH could consume its neighboring gas faster than being replenished by gas inflows. Our study demonstrates the need to consider different channels of black hole accretion that may provide clues for the existence of supermassive black holes at high redshifts.
