旋涡星系的精细化：用IMAGES对其祖先星系的形态运动学分析
The elaboration of spiral galaxies: morpho-kinematics analyses of their progenitors with IMAGES
摘要：
IXFS项目的目标是测量在CDFS、CFRS和HDFS领域中选择的z=0.4-0.75的100个大质量星系的代表性样本的速度场。它采用了世界上独一无二的FLAMES/ GIRAFFE在VLT的多个积分场单元模式。解析的运动学数据使我们能够对每个星系的大尺度运动进行采样。它们已经与最深的HST/ACS，Spitzer（MIPS和IRAC）和VLT/FORS 2相结合。大多数中等红移的星系都显示出异常的速度场：6 Gyrs以前，现在的螺旋星系中有一半是不平衡的，并且具有特殊的形态。这些领域丰富的数据使我们能够模拟每个星系中的物理过程，其准确性几乎与本地宇宙中所做的相似。这些详细的分析揭示了合并进程的重要性，包括其剩余阶段。再加上螺旋性质的巨大演变，这指出了磁盘生存的重要性，并加强了磁盘重建的情况。这表明分层方案可能适用于盘星系的详细描述，就像它适用于椭圆星系一样。
英文摘要：
The IMAGES project aims at measuring the velocity fields of a representative sample of 100 massive galaxies at z=0.4-0.75, selected in the CDFS, the CFRS and the HDFS fields. It uses the world-unique mode of multiple integral field units of FLAMES/ GIRAFFE at VLT. The resolved-kinematics data allow us to sample the large scale motions at ~ few kpc scale for each galaxy. They have been combined with the deepest HST/ACS, Spitzer (MIPS and IRAC) and VLT/FORS2 ever achieved observations. Most intermediate redshift galaxies show anomalous velocity fields: 6 Gyrs ago, half of the present day spirals were out of equilibrium and had peculiar morphologies. The wealth of the data in these fields allow us to modelize the physical processes in each galaxy with an accuracy almost similar to what is done in the local Universe. These detailed analyses reveal the importance of merger processes, including their remnant phases. Together with the large evolution of spiral properties, this points out the importance of disk survival and strengthens the disk rebuilding scenario. This suggests that the hierarchical scenario may apply to the elaboration of disk galaxies as it does for ellipticals.
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