Title: The Mid-Infrared Luminosity Evolution and Luminosity Function of Quasars with SDSS and WISE Show Chinese title

Title: SDSS和WISE的类星体中红外光度演化和光度函数

Abstract: We determine the 22$\mu$m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux-limited Sloan Digital Sky Survey optical and Wide field Infrared Survey Explorer mid-infrared data. We apply methods developed in previous works to access the intrinsic population distributions non-parametrically, taking into account the truncations and correlations inherent in the data. We find that the population of quasars exhibits positive luminosity evolution with redshift in the mid-infrared, but with considerably less mid-infrared evolution than in the optical or radio bands. With the luminosity evolutions accounted for, we determine the density evolution and local mid-infrared luminosity function. The latter displays a sharp flattening at local luminosities below $\sim 10^{31}$ erg sec$^{-1}$ Hz$^{-1}$, which has been reported previously at 15 $\mu$m for AGN classified as both type-1 and type-2. We calculate the integrated total emission from quasars at 22 $\mu$m and find it to be a small fraction of both the cosmic infrared background light and the integrated emission from all sources at this wavelength. Show Chinese abstract

Abstract: 我们确定了22$\mu$m的光度演化和类星体的光度函数，数据集来自结合流量限制的斯隆数字天空调查光学数据和宽场红外巡天探测器中红外数据的超过20,000个天体。 我们应用了之前工作中开发的方法，非参数地分析固有星系分布，考虑数据中固有的截断和相关性。 我们发现类星体种群在中红外波段随红移表现出正的光度演化，但其演化程度远小于光学或射电波段。 在考虑了光度演化后，我们确定了密度演化和本地中红外光度函数。 后者在本地光度低于$\sim 10^{31}$erg sec$^{-1}$Hz$^{-1}$时表现出明显的平坦化，此前已在15 $\mu$m波长对被分类为1型和2型活动星系核的AGN中报告过。 我们在22 $\mu$m波长计算了类星体的总发射量，发现它仅为宇宙红外背景光和该波长所有源的总发射量的一小部分。