用气体调节器模型解释宇宙远红外背景各向异性
Interpreting the cosmic far-infrared background anisotropies using a gas regulator model
摘要：
宇宙远红外背景辐射（CFIRB）是研究恒星形成速率（SFR）历史以及重子与暗物质之间联系的有力工具。在这项工作中，我们探讨在何种程度上CFIRB各向异性可以复制星系演化的一个简单的物理框架，气体调节器（浴缸）模型。这个模型基于气体、恒星和金属的连续性方程，考虑了宇宙气体吸积、恒星形成和气体喷射。我们的模型的大规模的星系偏差和小规模的散粒噪声自洽，我们约束我们的模型使用的CFIRB功率谱测量普朗克。由于物理模型的简单性，拟合的拟合优度有限。我们比较我们的模型预测与CFIRB和引力透镜，热红外光度函数，亚毫米源计数之间的相关性。CFIRB的强烈聚集表明了一个大的星系偏差，这对应于z=2时质量为$10^{12.5} M_\odot$的晕，高于与恒星形成效率峰值相关的质量。我们还发现$10^{12} M_\odot$以上晕的远红外光度比紫外和光学巡天观测到的SFR的预期值要高。
英文摘要：
Cosmic far-infrared background (CFIRB) is a powerful probe of the history of star formation rate (SFR) and the connection between baryons and dark matter across cosmic time. In this work, we explore to which extent the CFIRB anisotropies can be reproduced by a simple physical framework for galaxy evolution, the gas regulator (bathtub) model. This model is based on continuity equations for gas, stars, and metals, taking into account cosmic gas accretion, star formation, and gas ejection. We model the large-scale galaxy bias and small-scale shot noise self-consistently, and we constrain our model using the CFIRB power spectra measured by Planck. Because of the simplicity of the physical model, the goodness of fit is limited. We compare our model predictions with the observed correlation between CFIRB and gravitational lensing, bolometric infrared luminosity functions, and submillimetre source counts. The strong clustering of CFIRB indicates a large galaxy bias, which corresponds to haloes of mass $10^{12.5} M_\odot$ at z=2, higher than the mass associated with the peak of the star formation efficiency. We also find that the far-infrared luminosities of haloes above $10^{12} M_\odot$ are higher than the expectation from the SFR observed in ultraviolet and optical surveys.
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