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arXiv 0912.2223astro-ph.CO
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超大质量黑洞演化的宇宙学模拟

Evolution of Supermassive Black Holes from Cosmological Simulations

Ch. Filloux, F. Durier, J. A. de Freitas Pacheco, J. Silk

摘要:

通过宇宙学模拟研究了超大质量黑洞的质量与宿主星系性质之间的关系。黑洞是由100个太阳质量的种子插入红移范围12-15的密度峰值中生长而成的。种子的生长基本上是通过从核盘中吸积物质,也通过合并事件产生的聚结。在z=0时,我们的模拟再现了黑洞质量函数和黑洞质量与恒星速度色散和宿主暗晕质量的相关性。此外,模拟得到的黑洞质量密度的演化与类星体的热光度函数的演化一致,表明模拟结果充分再现了类星体的平均吸积历史.然而,我们的模拟无法在$z\sim 6$形成质量超过$10^9 M_{\odot}$的黑洞,其存在是从斯隆巡天在这个红移范围内探测到的明亮类星体中推断出来的。

英文摘要:

The correlations between the mass of supermassive black holes and properties of their host galaxies are investigated through cosmological simulations. Black holes grow from seeds of 100 solar masses inserted into density peaks present in the redshift range 12-15. Seeds grow essentially by accreting matter from a nuclear disk and also by coalescences resulting from merger episodes. At z=0, our simulations reproduce the black hole mass function and the correlations of the black hole mass both with stellar velocity dispersion and host dark halo mass. Moreover, the evolution of the black hole mass density derived from the present simulations agrees with that derived from the bolometric luminosity function of quasars, indicating that the average accretion history of seeds is adequately reproduced . However, our simulations are unable to form black holes with masses above $10^9 M_{\odot}$ at $z\sim 6$, whose existence is inferred from the bright quasars detected by the Sloan survey in this redshift range.

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