红外巡天的后向演化模型：AGN -和Color-L_TIR分布的作用
A backward evolution model for infrared surveys: the role of AGN- and Color-L_TIR distributions
摘要：
红外亮星系的经验“向后”星系演化模型的约束使用多波段红外巡天。我们开发了一个新的蒙特卡罗算法，实现光度依赖的分布函数的星系的红外光谱能量分布（SED）和活动星系核的贡献，允许这些数量的演变。所采用的SEDs考虑到了恒星暴增和活动星系核对红外辐射的贡献，这是第一次在一个连贯的治疗，而不是调用单独的活动星系核和恒星形成的人口。在本文的第一部分中，我们考虑的AGN的贡献，作为总红外光度的函数的本地宇宙星系的量化。它是使用大量的LIRGs和ULIRGs样本制作的，这些样本的中红外光谱在斯皮策档案中可用。在第二部分中，我们提出了模型。我们的最佳拟合模型采用非常强的光度演化，$L=L_0(1+z)^{3.4}$，直到$z=2.3$，和密度演化，$ρ=ρ_0(1+z)^2$，直到$z=1$，红外星系的人口。在较高的$z$下，进化速率分别随着$(1+z)^{-1}$和$(1+z)^{-1.5}$而下降。为了再现中红外到亚毫米波的计数和红移分布，有必要引入活动星系核贡献的演化和光度-温度关系的演化。我们的模型与当前基于光度测量的对典型活动星系核贡献（作为中红外通量的函数）的估计似乎一致，并且很好地与即将到来的斯皮策光谱结果进行比较。作为未来应用的一个例子，我们使用我们的最佳拟合模型来预测Herschel的调查。
英文摘要：
Empirical "backward" galaxy evolution models for infrared bright galaxies are constrained using multi-band infrared surveys. We developed a new Monte-Carlo algorithm for this task, implementing luminosity dependent distribution functions for the galaxies' infrared spectral energy distributions (SEDs) and for the AGN contribution, allowing for evolution of these quantities. The adopted SEDs take into account the contributions of both starbursts and AGN to the infrared emission, for the first time in a coherent treatment rather than invoking separate AGN and star-forming populations. In the first part of the paper we consider the quantification of the AGN contribution for local universe galaxies, as a function of total infrared luminosity. It is made using a large sample of LIRGs and ULIRGs for which mid-infrared spectra are available in the Spitzer archive. In the second part we present the model. Our best-fit model adopts very strong luminosity evolution, $L=L_0(1+z)^{3.4}$, up to $z=2.3$, and density evolution, $ρ=ρ_0(1+z)^2$, up to $z=1$, for the population of infrared galaxies. At higher $z$, the evolution rates drop as $(1+z)^{-1}$ and $(1+z)^{-1.5}$ respectively. To reproduce mid-infrared to submillimeter number counts and redshift distributions, it is necessary to introduce both an evolution in the AGN contribution and an evolution in the luminosity-temperature relation. Our models are in plausible agreement with current photometry-based estimates of the typical AGN contribution as a function of mid-infrared flux, and well placed to be compared to upcoming Spitzer spectroscopic results. As an example of future applications, we use our best-fitting model to make predictions for surveys with Herschel.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
