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arXiv 1512.03434astro-ph.GAastro-ph.CO
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种子黑洞的膨胀驱动燃料补充

Bulge-driven Fueling of Seed Black Holes

KwangHo Park, Massimo Ricotti, Priyamvada Natarajan, Tamara Bogdanović, John H. Wise

摘要:

我们研究了辐射调节吸积到中等质量和大质量黑洞(BH)嵌入在一个凸起组件。利用球对称一维辐射流体动力学模拟,我们跟踪了从温度为10^4 K的冷中性气体库中吸积的黑洞的生长。我们发现包埋在球丘中的黑洞的吸积速率与r_{B,eff} /r_B成正比,其中r_{B,eff}是包含球丘引力势的有效Bondi半径,r_B是黑洞的Bondi半径.当不考虑膨胀时,来自黑洞的辐射反馈将冷吸积速率抑制到邦迪速率的约1%。然而,我们发现,BH燃料添加率迅速增加时,鼓包质量M_bulge大于临界值10^6 M_sun,并与M_bulge成正比。由于临界膨胀质量与BH中心质量M_{BH}无关,因此质量为10^2、10^4和10^6 M太阳的BH的增长率明显依赖于膨胀-BH质量比。我们的结果意味着,可能是Pop III星残余的光种子黑洞(<= 10^2 M_sun),在星系核达到临界质量之前,不能与宿主星系核球的早期组装同时通过吸积而生长。然而,可能通过直接坍缩形成的大质量BH种子(>= 10^5 M_sun)更有可能嵌入超临界核球中,因此可以有效地与宿主星系耦合并驱动M_{BH} - $σ$关系的早期演化。

英文摘要:

We examine radiation-regulated accretion onto intermediate-mass and massive black holes (BHs) embedded in a bulge component. Using spherically symmetric one-dimensional radiation-hydrodynamics simulations, we track the growth of BHs accreting from a cold, neutral gas reservoir with temperature T=10^4 K. We find that the accretion rate of BHs embedded in bulges is proportional to r_{B,eff}/r_B, where r_{B,eff} is the increased effective Bondi radius that includes the gravitational potential of the bulge, and r_B is the Bondi radius of the BH. The radiative feedback from the BH suppresses the cold accretion rate to ~1 percent of the Bondi rate when a bulge is not considered. However, we find that the BH fueling rate increases rapidly when the bulge mass M_bulge is greater than the critical value of 10^6 M_sun and is proportional to M_bulge. Since the critical bulge mass is independent of the central BH mass M_{BH}, the growth rate of BHs with masses of 10^2, 10^4, and 10^6 M_sun exhibits distinct dependencies on the bulge-to-BH mass ratio. Our results imply that light seed BHs (<= 10^2 M_sun) which might be the remnants of the Pop III stars, cannot grow through accretion coevally with the early assembly of the bulge of the host galaxies until the bulge reaches the critical mass. However, massive BH seeds (>= 10^5 M_sun) that may form via direct collapse, are more likely to be embedded in a supercritical bulge and thus can grow efficiently coupling to the host galaxies and driving the early evolution of the M_{BH}-$σ$ relationship.

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