LSD和AMAZE：z>3时的质量-金属丰度关系
LSD and AMAZE: the mass-metallicity relation at z>3
摘要：
本文介绍了两个项目LSD（Lyman-break galaxies恒星星族和动力学）和AMAZE（Assessing the Mass Abscribed Redshift Evolution）在z>3时星系金属丰度演化的初步结果。这些项目利用对约40个LBG样品的深近红外光谱观测，从发射线估计气相金属丰度。我们推导了z $>$ 3处的质量-金属丰度关系，并与低红移处的相同关系进行了比较。观测到从z=0和z=2到z=3的强烈演化，这一发现对星系演化模型提出了强约束。这些初步结果表明，有效氧产额不随恒星质量的增加而增加，这意味着简单的外流模型在z>3时不适用。
英文摘要：
We present the first results on galaxy metallicity evolution at z>3 from two projects, LSD (Lyman-break galaxies Stellar populations and Dynamics) and AMAZE (Assessing the Mass Abundance redshift Evolution). These projects use deep near-infrared spectroscopic observations of a sample of ~40 LBGs to estimate the gas-phase metallicity from the emission lines. We derive the mass-metallicity relation at z$>$3 and compare it with the same relation at lower redshift. Strong evolution from z=0 and z=2 to z=3 is observed, and this finding puts strong constrains on the models of galaxy evolution. These preliminary results show that the effective oxygen yields does not increase with stellar mass, implying that the simple outflow model does not apply at z>3.
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