GOODS和GEMS中的星系团半导体：局域矮不规则体的大量类似物
Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars
摘要：
在GEMS和GOODS领域的cluristic星系检查的线索，他们演变成现代的螺旋。测量了团块的大小和团块间区域的表面亮度，并将其拟合到恒星年龄和质量的模型中。从没有明显团间发射的团簇到有淡红盘的团簇，再到絮状或大设计类型的旋涡星系，都有一个演化的趋势。沿着这个序列，interclump表面密度增加和质量表面密度之间的对比度的团块和interclump区域减少，这表明一个逐渐分散的团块，形成磁盘。此外，沿着这个序列，隆起的团块质量比和年龄比增加，这表明一个逐渐形成的隆起。所有这些形态类型都出现在相同的红移范围内，表明团簇形态不是带移的结果。与具有相同静止波长和空间分辨率的本地星系的比较表明，团簇类似于本地矮不规则星。这种相似性与一种模型是一致的，在该模型中，cluerical形态来自于气体中的引力不稳定性，与旋转速度相比具有高湍流速度，与恒星相比具有高质量分数。
英文摘要：
Clumpy galaxies in the GEMS and GOODS fields are examined for clues to their evolution into modern spirals. The magnitudes of the clumps and the surface brightnesses of the interclump regions are measured and fitted to models of stellar age and mass. There is an evolutionary trend from clump clusters with no evident interclump emission to clump clusters with faint red disks, to spiral galaxies of the flocculent or grand design types. Along this sequence, the interclump surface density increases and the mass surface density contrast between the clumps and the interclump regions decreases, suggesting a gradual dispersal of clumps to form disks. Also along this sequence, the bulge-to-clump mass ratios and age ratios increase, suggesting a gradual formation of bulges. All of these morphological types occur in the same redshift range, indicating that the clump cluster morphology is not the result of bandshifting. Comparisons to local galaxies with the same rest wavelength and spatial resolution show that clump clusters resemble local dwarf Irregulars. This resemblance is consistent with a model in which the clumpy morphology comes from gravitational instabilities in gas with a high turbulent speed compared to the rotation speed and a high mass fraction compared to the stars.
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