On the Connection between Supermassive Black Holes and Galaxy Growth in the Reionization Epoch
On the Connection between Supermassive Black Holes and Galaxy Growth in the Reionization Epoch
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DOI：
10.3847/2041-8213/ac6de8
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发表时间：
2022-03
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影响因子：
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通讯作者：
Junyao Li;J. Silverman;T. Izumi;W. He;M. Akiyama;K. Inayoshi;Y. Matsuoka;M. Onoue;Y. Toba-
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文献类型：
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作者：
Junyao Li;J. Silverman;T. Izumi;W. He;M. Akiyama;K. Inayoshi;Y. Matsuoka;M. Onoue;Y. Toba-
超大质量黑洞(SMBH；BH)和它们的宿主星系(⋆)在再电离时期的质量之间的关系为它们的早期生长提供了有价值的限制。与局部值相比，高红移类星体的、BH/⋆比值明显升高。然而，对于最遥远的类星体来说，这种明显的偏差在多大程度上受到观测偏差的影响尚不清楚。为了解决这个问题，我们对z∼6上的20个类星体的样本选择和测量偏差进行了建模，这些类星体具有基于ALMA观测的宿主属性。我们发现，通过假设z处的⋆布居遵循局域宇宙中的关系，可以重现观测到的类星体在∼BH-SMB6平面上的分布。然而，BH/⋆的正向甚至负向演化也可以解释数据，这取决于本征散射是否演化以及各种系统不确定性的强度。为了打破这些简并，需要提高质量测量的精度，并将当前样品扩展到较低的BH限值。此外，假设辐射效率为0.1，类星体占空比由活跃的黑洞占空比估计，BH/⋆中的显著异常值在其瞬时黑洞增长率和恒星形成率的情况下倾向于向局域关系移动。这可能为在z∼6时存在自我调节的SMBH-星系共同进化场景提供证据，活动星系核反馈是可能的驱动因素。
The correlation between the mass of supermassive black holes (SMBHs; BH ) and their host galaxies ( ⋆ ) in the reionization epoch provides valuable constraints on their early growth. High-redshift quasars typically have an BH / ⋆ ratio significantly elevated in comparison to the local value. However, the degree to which this apparent offset is driven by observational biases is unclear for the most distant quasars. To address this issue, we model the sample selection and measurement biases for a compilation of 20 quasars at z ∼ 6 with host properties based on ALMA observations. We find that the observed distribution of quasars in the BH–⋆ plane can be reproduced by assuming that the underlying SMBH population at z ∼ 6 follows the relationship in the local universe. However, a positive or even a negative evolution in BH / ⋆ can also explain the data, depending on whether the intrinsic scatter evolves and on the strength of various systematic uncertainties. To break these degeneracies, an improvement in the accuracy of mass measurements and an expansion of the current sample to lower BH limits are needed. Furthermore, assuming a radiative efficiency of 0.1 and quasar duty cycles estimated from the active SMBH fraction, significant outliers in BH / ⋆ tend to move toward the local relation given their instantaneous BH growth rate and star formation rate. This may provide evidence for a self-regulated SMBH–galaxy coevolution scenario that is in place at z ∼ 6, with active galactic nucleus feedback being a possible driver.