Correlations in the Far-Infrared Background
Correlations in the Far-Infrared Background
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远红外背景的相关性
DOI：
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发表时间：
1999
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通讯作者：
Lloyd Knox
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文献类型：
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作者：
Z. Haiman;Lloyd Knox
计算了宇宙远红外背景辐射的角功率谱。我们发现，由于源相关性的信号占主导地位的散粒噪声为1 × 1000，并导致各向异性与均方根幅度[l（l + 1）Cl/2π]1/2之间的5%和10%的平均值为1 × 150。角功率谱取决于几个未知量，例如紫外通量密度演化、尘埃的光学性质、FIRB源的偏置以及宇宙学参数。然而，当我们要求我们的模型重现所观察到的直流水平的FIRB，我们发现，各向异性是至少在所有情况下的百分之几。这种各向异性是可检测的拟议仪器，它的测量将提供强有力的约束模型的星系演化和大尺度结构的红移到至少z ~ 5。
We compute the expected angular power spectrum of the cosmic far infrared background (FIRB). We find that the signal due to source correlations dominates the shot noise for l ≲ 1000 and results in anisotropies with rms amplitudes [l(l + 1)Cl/2π]1/2 between 5% and 10% of the mean for l ≳ 150. The angular power spectrum depends on several unknown quantities, such as the UV flux density evolution, optical properties of the dust, biasing of the sources of the FIRB, and cosmological parameters. However, when we require our models to reproduce the observed direct current level of the FIRB, we find that the anisotropy is at least a few percent in all cases. This anisotropy is detectable with proposed instruments, and its measurement will provide strong constraints on models of galaxy evolution and large-scale structure at redshifts up to at least z ~ 5.