在1<z<2时测试不同的恒星质量估计值
Testing different stellar mass estimators at 1<z<2
摘要：
星系的物理参数（如光度，恒星质量，年龄）通常是通过模型模板，最适合他们的分光光度数据。我们进行了一个定量的测试，旨在探索的能力，这一程序在恢复的物理参数的早型星系在1<z<2。利用模拟得到的各种各样的SEDs，再现了1<z<2的早型星系的SEDs，并给出了它们的年龄和质量，建立了模拟的光度星表，其波长覆盖范围和光度不确定度与两个专题巡天（VVDS和GOODS）相似。模拟光度数据的最佳拟合分析允许研究恢复参数和输入参数之间的差异。结果表明，通过光学波段测量的恒星质量的影响较大的不确定性相对于那些从近红外波段，他们经常低估的真实值。V波段的M/L比结果被严重低估，即使是从最近提出的基于静止帧光学颜色（例如（B-V））的配方中得出的。
英文摘要：
Physical parameters of galaxies (as luminosity, stellar mass, age) are often derived by means of the model templates which best fit their spectro-photometric data. We have performed a quantitative test aimed at exploring the ability of this procedure in recovering the physical parameters of early-type galaxies at 1<z<2. A wide range of simulated SEDs, reproducing those of early-type galaxies at 1<z<2 with assigned age and mass, are used to build mock photometric catalogs with wavelength coverage and photometric uncertainties similar to those of two topical surveys (i.e. VVDS and GOODS). The best fitting analysis of the simulated photometric data allows to study the differences among the recovered parameters and the input ones. Results indicate that the stellar masses measured by means of optical bands are affected by larger uncertainties with respect to those obtained from near-IR bands, and they frequently underestimate the real values. The M/L ratio in the V band results strongly underestimated, even when derived from the recently proposed recipe based on rest-frame optical colours (e.g. (B-V)).
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