中等红移亮星系团星系演化的定量测量
Quantitative measure of evolution of bright cluster galaxies at moderate redshifts
摘要：
利用哈勃太空望远镜的档案数据，我们研究了光谱确认的明亮星系的核心区域的红移范围从$z = 0.31$到$z = 0.84$的9个星系团的定量形态演化。我们使用来自二维鼓盘分解的形态参数来研究演化。我们发现随着宇宙的演化，平均膨胀与总光度之比$B/T$会增加。我们还发现相应的增加早型星系的比例和平均Sérsic指数。我们讨论了这些结果及其对星系形态演化的物理机制的影响。
英文摘要：
Using archival data from the Hubble Space Telescope, we study the quantitative morphological evolution of spectroscopically confirmed bright galaxies in the core regions of nine clusters ranging in redshift from $z = 0.31$ to $z = 0.84$. We use morphological parameters derived from two dimensional bulge-disk decomposition to study the evolution. We find an increase in the mean bulge-to-total luminosity ratio $B/T$ as the Universe evolves. We also find a corresponding increase in the fraction of early type galaxies and in the mean Sérsic index. We discuss these results and their implications to physical mechanisms for evolution of galaxy morphology.
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