标题： 早期类型星系在星系团中的年龄：观测视角 显示英文标题

标题： The age of early-type galaxies in clusters: an observational perspective

摘要： 在中等红移处透镜状星系（S0s）演化的矛盾结果最近已被发表。 对所使用方法的仔细分析表明，为了深入了解形态类型的变化，有必要：（1）使用定量形态类型，（2）在用于测量S0s演化的量中传播形态误差，以及（3）在高红移和低红shift时采用相同的形态类别，并测试与标准类型的对应关系。 一些已发表的分析至少未能满足上述三个条件中的一个，从而削弱了对中等红移星系团中S0s年轻年龄的主张。 显示英文摘要

摘要： Contradictory results on the evolution of lenticular galaxies (S0s) at intermediate redshift have been recently published. A careful analysis of the used methodology shows that in order to gain insights on the evolution of the morphological types it is necessary: (1) to use quantitative morphological types, (2) to propagate morphological errors in the quantity used to measure the evolution of the S0s and (3) to adopt the same morphological classes at high as at low redshift, testing the correspondence with standard types. Some published analysis fail to satisfy at least one of the above three conditions, thus undermining the claim for a young age of S0s of intermediate redshift clusters.