Constraining thermal dust emission in distant galaxies with number counts and angular power spectra
Constraining thermal dust emission in distant galaxies with number counts and angular power spectra
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DOI：
10.1093/mnras/stt1703
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发表时间：
2012-10
影响因子：
4.8
通讯作者：
G. Addison;G. Addison;J. Dunkley;J. Bond
中科院分区：
文献类型：
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作者：
G. Addison;G. Addison;J. Dunkley;J. Bond
我们对来自Spitzer的MIPS和Herschel的SPIRE仪器的差值计数，以及来自SPIRE、普朗克、阿塔卡马宇宙学望远镜和南极望远镜的宇宙红外背景(CIB)各向异性的角功率谱进行了联合拟合，这些望远镜总共跨越220和4300(70和1400)。我们同时约束了尘埃光度函数、热尘埃光谱能量分布(SED)和CIB源的星团性质，以及这些量随宇宙时间的演化。我们发现这些数据强烈要求热尘埃SED的红移演化。在我们采用的参数化中，这种演化表现为高红移时灰体尘埃温度的增加，但它也可能与温度-尘埃光度相关或尘埃不透明度的演化有关。计数和光谱一起将热尘埃光度函数的演化限制在z~2.5-3以下，补充了依赖于对最稀有明亮天体的静止框架中红外观测的方法。我们能够在不需要复杂的光晕模型方法的情况下拟合功率谱，并表明忽略依赖于尺度的光晕偏差可能会损害使用这个框架的分析。
We perform a joint fit to differential number counts from Spitzer's MIPS and Herschel's SPIRE instruments, and angular power spectra of cosmic infrared background (CIB) anisotropies from SPIRE, Planck, the Atacama Cosmology Telescope, and the South Pole Telescope, which together span 220 < \nu / GHz < 4300 (70 < \lambda / \mu m < 1400). We simultaneously constrain the dust luminosity function, thermal dust spectral energy distribution (SED) and clustering properties of CIB sources, and the evolution of these quantities over cosmic time. We find that the data strongly require redshift evolution in the thermal dust SED. In our adopted parametrization, this evolution takes the form of an increase in graybody dust temperature at high redshift, but it may also be related to a temperature - dust luminosity correlation or evolution in dust opacity. The counts and spectra together constrain the evolution of the thermal dust luminosity function up to z ~ 2.5-3, complementing approaches relying on rest-frame mid-infrared observations of the rarest bright objects. We are able to fit the power spectra without requiring a complex halo model approach, and show that neglecting scale-dependent halo bias may be impairing analyses that do use this framework.