黑洞-星系标度关系的非因果起源
The non-causal origin of the black hole-galaxy scaling relations
摘要：
我们发现，从本地到高z宇宙观测到的黑洞-凸起质量标度关系可以在很大程度上甚至完全由非因果起源解释，即它们并不意味着需要任何物理耦合的黑洞和凸起质量的增长，例如通过活动星系核（AGN）的反馈。提供一些物理学的绝对标准化，创建的标度关系可以完全解释的层次组装的黑洞和恒星质量通过星系合并，从一个最初的不相关的分布BH和恒星质量在早期宇宙。我们表明这与一套暗物质晕合并树，我们假设（不相关）黑洞和恒星质量值在宇宙早期。然后，我们遵循的光环中存在的全球性恒星形成和黑洞吸积食谱，（一）工作没有任何耦合的两个属性每个单独的星系和（ii）正确地再现所观察到的恒星形成和黑洞吸积率密度在宇宙中。包括合并中的盘到隆起的转换，我们的模拟甚至在z=0处为M_BH-M_隆起关系创建了~1.1的观测斜率。这也意味着活动星系核的反馈并不是星系演化的必要因素（尽管仍然是可能的）。有鉴于此，其他可以用来截断大质量星系中恒星形成的机制也同样合理。
英文摘要：
We show that the black hole-bulge mass scaling relations observed from the local to the high-z Universe can be largely or even entirely explained by a non-causal origin, i.e. they do not imply the need for any physically coupled growth of black hole and bulge mass, for example through feedback by active galactic nuclei (AGN). Provided some physics for the absolute normalisation, the creation of the scaling relations can be fully explained by the hierarchical assembly of black hole and stellar mass through galaxy merging, from an initially uncorrelated distribution of BH and stellar masses in the early Universe. We show this with a suite of dark matter halo merger trees for which we make assumptions about (uncorrelated) black hole and stellar mass values at early cosmic times. We then follow the halos in the presence of global star formation and black hole accretion recipes that (i) work without any coupling of the two properties per individual galaxy and (ii) correctly reproduce the observed star formation and black hole accretion rate density in the Universe. With disk-to-bulge conversion in mergers included, our simulations even create the observed slope of ~1.1 for the M_BH-M_bulge-relations at z=0. This also implies that AGN feedback is not a required (though still a possible) ingredient in galaxy evolution. In light of this, other mechanisms that can be invoked to truncate star formation in massive galaxies are equally justified.
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