来自组合MGC、SDSS和UKIDSS LAS数据集的ugrizYJHK光度分布和密度
The ugrizYJHK luminosity distributions and densities from the combined MGC, SDSS and UKIDSS LAS datasets
摘要：
我们将MGC、SDSS和UKIDSS LAS巡天的数据结合起来，在一个普通的低红移体积（z<0.1，L* 系统约为71，000 h_1^-3 Mpc^3）内生成了光谱完整性为100%的ugrizYJHK光度函数和密度。在光学拟合Schechter函数的形状与以前报道的值相当，但具有更高的归一化（通常u，g，r，i，z的phi* 值分别比SDSS团队报道的高0，30，20，15，5%）。我们将这些归因于探测的红移范围的差异，不完整性，并采用了归一化方法。在近红外光谱中，我们发现显着不同的Schechter函数参数（主要是在M* 值），以前的报告和属性，这是改善成像数据的质量比以前的研究。这是第一次对河外光度密度进行均匀测量，它对光学和近红外区域进行了全面采样。与以前的汇编，已注意到光学和近红外制度之间的不连续性，我们的同质数据集显示了一个平滑的宇宙光谱能量分布（CSED）。修正后的尘埃衰减，我们比较我们的CSED的预期值的基础上最近的限制宇宙恒星形成的历史和初始质量函数。
英文摘要：
We combine data from the MGC, SDSS and UKIDSS LAS surveys to produce ugrizYJHK luminosity functions and densities from within a common, low redshift volume (z<0.1, ~71,000 h_1^-3 Mpc^3 for L* systems) with 100 per cent spectroscopic completeness. In the optical the fitted Schechter functions are comparable in shape to those previously reported values but with higher normalisations (typically 0, 30, 20, 15, 5 per cent higher phi*-values in u, g, r, i, z respectively over those reported by the SDSS team). We attribute these to differences in the redshift ranges probed, incompleteness, and adopted normalisation methods. In the NIR we find significantly different Schechter function parameters (mainly in the M* values) to those previously reported and attribute this to the improvement in the quality of the imaging data over previous studies. This is the first homogeneous measurement of the extragalactic luminosity density which fully samples both the optical and near-IR regimes. Unlike previous compilations that have noted a discontinuity between the optical and near-IR regimes our homogeneous dataset shows a smooth cosmic spectral energy distribution (CSED). After correcting for dust attenuation we compare our CSED to the expected values based on recent constraints on the cosmic star-formation history and the initial mass function.
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