MODS中静止星系的总中心光度比作为大小演化的指示
Total to central luminosity ratios of quiescent galaxies in MODS as an indicator of size evolution
摘要:
利用MOIRCS深巡天GOODS-N极深区域的Subaru影像和HST/ACS影像,我们在一个静止坐标系中测量了z<3.5的大质量(M>10^{10.5} M_{Sun})星系在固定半径处的外中心区域的光度比(LR),作为研究星系大小演化问题的一种新方法。我们没有观察到中位LR的任何变化。如果发生了显著的尺寸增长,那么外部与中心的光度比将随着红移的减小而相应地增加。
英文摘要:
Using the very deep Subaru images of the GOODS-N region, from the MOIRCS Deep Survey and images from the HST/ACS, we have measured the Luminosity Ratio (LR) of the outer to the central regions of massive (M>10^{10.5}M_{Sun}) galaxies at fixed radii in a single rest-frame for z<3.5 as a new approach to the problem of size evolution. We didn't observe any evolution in the median LR. Had a significant size growth occurred, the outer to central luminosity ratios would have demonstrated a corresponding increase with a decrease in redshift.
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