被动星系团的尺寸演化：来自Wide Field Camera 3早期发布科学计划的观测
The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program
摘要：
我们目前的结果被动演化星系的大小演变1<z<2从宽视场相机3早期发布的科学计划。我们的样本是使用类似于被动BzK选择标准的方法构建的，该标准隔离了在z>1.5时几乎没有或没有正在形成恒星的星系。我们确定了30个星系在~40平方弧分到H<25马格。我们补充了光谱红移从文献与光度红移确定的15带测光从0.22-8微米。我们确定有效半径Sersic配置文件适合使用经验PSF的H波段图像。我们发现，星系的大小演化是恒星质量的一个强函数，从z~2到现在，质量最大（M* ~ 10^11 Msol）的星系经历了最快速的演化。将大小演化参数化为（1+z）^{-alpha}，我们发现α和恒星质量之间的暂定标度为α ~ -1.8+1.4 log（M*/10^9 Msol）。我们简要地讨论了这一结果的影响，为我们了解的红星系的动力学演化。
英文摘要：
We present results on the size evolution of passively evolving galaxies at 1<z<2 drawn from the Wide Field Camera 3 Early Release Science program. Our sample was constructed using an analog to the passive BzK selection criterion, which isolates galaxies with little or no on-going star formation at z>1.5. We identify 30 galaxies in ~40 square arcmin to H<25 mag. We supplement spectroscopic redshifts from the literature with photometric redshifts determined from the 15-band photometry from 0.22-8 micron. We determine effective radii from Sersic profile fits to the H-band image using an empirical PSF. We find that size evolution is a strong function of stellar mass, with the most massive (M* ~ 10^11 Msol) galaxies undergoing the most rapid evolution from z~2 to the present. Parameterizing the size evolution as (1+z)^{-alpha}, we find a tentative scaling between alpha and stellar mass of alpha ~ -1.8+1.4 log(M*/10^9 Msol). We briefly discuss the implications of this result for our understanding of the dynamical evolution of the red galaxies.
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