光度极大似然法简介：MUSYC-ECDFS中z<1.2的星系光度函数
Introducing the Photometric Maximum Likelihood Method: Galaxy Luminosity Functions at z<1.2 in MUSYC-ECDFS
摘要：
本文提出了一种新的极大似然方法，用于在没有光谱数据的情况下从多波段光度测量中计算星系光度函数。该方法通过直接比较多维光度空间中通量的预测分布与观测结果来评估试验光度函数的可能性，因此不需要计算光度红移的中间步骤。我们将该算法应用于MUSYC-ECDFS场中约27，000个m_R<=25的星系，重点恢复z<1.2的场星系的光度函数。我们的最深LF达到M_r=-14，表明场星系LF偏离了Schechter函数，在中等量级处表现出陡峭的上升，这是由于晚光谱类型的星系。
英文摘要：
We present a new maximum likelihood method for the calculation of galaxy luminosity functions from multi-band photometric surveys without spectroscopic data. The method evaluates the likelihood of a trial luminosity function by directly comparing the predicted distribution of fluxes in a multi-dimensional photometric space to the observations, and thus does not require the intermediate step of calculating photometric redshifts. We apply this algorithm to ~27,000 galaxies with m_R<=25 in the MUSYC-ECDFS field, with a focus on recovering the luminosity function of field galaxies at z<1.2. Our deepest LFs reach M_r=-14 and show that the field galaxy LF deviates from a Schechter function, exhibiting a steep upturn at intermediate magnitudes that is due to galaxies of late spectral types.
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