论文标题
宇宙红外背景的简单光环模型形式主义及其与Thermal Sunyaev Zel'Dovich效果的相关性
Simple halo model formalism for the cosmic infrared background and its correlation with the thermal Sunyaev Zel'dovich effect
论文作者
论文摘要
由于银河发展的复杂性质，在所有量表上对CIB中的各向异性进行建模是一项具有挑战性的任务，因此通常需要太多参数以适合观察数据。在本文中，我们仅使用四个参数提出了一个新的CIB各向异性的Halo模型。我们的模型将暗物质光环的质量积聚连接到恒星形成速率。使用此模型，我们发现，将积聚的重子转换为恒星的最大效率的光环质量为$ \ log_ {10} m_ \ Mathrm {max} = {12.94}^{+0.02} _ { - 0.02} _ { - 0.02} \：m_ \ odot $，一致于其他研究。考虑到通过恒星进化的质量损失，我们发现，对于中级星系，恒星形成效率定义为$ m_ \ star（z）/m_b（z）/m_b（z）$分别等于0.19和0.21，在红移0.1和2时，与先前的研究获得了良好的一致性。这是第一次使用CIB模型同时使用Planck和Herschel CIB功率谱。但是，我们发现大的角度刻度Planck和Herschel数据与小型Herschel数据并不完全兼容（对于$ \ ell> 3000 $）。预计CIB与星系簇的TSZ信号相关。使用此HALO模型作为CIB，以及具有单个参数的TSZ的Halo模型，我们还提供了一个一致的框架来计算此互相关，这不需要额外的参数。当通过两个广泛间隔的频道（例如143x857 GHz）组合推断出，发现CIB $ \ times $ tsz相关性较高。 CIB，TSZ和CIB $ \ times $ tsz充当前景，同时测量CMB功率谱的KSZ功率谱，需要删除。由于其简单的性质和参数数量少，因此此处介绍的Halo模型形式主义对于此类分析以准确测量KSZ功率谱非常有用。
Modelling the anisotropies in the CIB on all the scales is a challenging task due to the complex nature of the galaxy evolution and thus often requires too many parameters in order to fit the observational data. In this paper, we present a new halo model for the anisotropies of the CIB using only four parameters. Our model connects the mass accretion on the dark matter halos to the star formation rate. Using this model, we find that the halo mass with the maximum efficiency for converting the accreted baryons into stars is $\log_{10}M_\mathrm{max} = {12.94}^{+0.02}_{-0.02} \: M_\odot$, consistent with other studies. Accounting for the mass loss through stellar evolution, we find, for an intermediate age galaxy, that the star formation efficiency defined as $M_\star(z)/M_b(z)$ is equal to 0.19 and 0.21 at redshift 0.1 and 2 respectively, in good agreement with the values obtained by previous studies. It is the first time that a CIB model is used to fit Planck and Herschel CIB power spectra simultaneously. However we find that the large angular scale Planck and Herschel data are not fully compatible with the small scale Herschel data (for $\ell>3000$). The CIB is expected to be correlated with the tSZ signal of the galaxy clusters. Using this halo model for the CIB, and a halo model for the tSZ with a single parameter, we also provide a consistent framework to calculate this cross-correlation, which requires no extra parameter. The CIB$\times$tSZ correlation is found to be higher when inferred with a combination of two widely spaced frequency channels (e.g. 143x857 GHz). The CIB, tSZ, and CIB$\times$tSZ act as foregrounds while measuring the kSZ power spectrum from the CMB power spectrum and need to be removed. Due to its simplistic nature and low number of parameters, the halo model formalism presented here is quite useful for such an analysis to measure the kSZ power spectrum accurately.
